Gaskets for Water | McMaster-Carr

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About O-Rings

Oil-Resistant Buna-N O-Rings

Made of Buna-N, these O-rings resist grease, hydraulic oil, and motor oil—plus mild chemicals and water.

Oil-Resistant Metal-Detectable Buna-N O-Rings

If these O-rings deteriorate, they can be picked up by metal detection systems.

Chemical-Resistant
Low-Temperature Fluorosilicone O-Rings for
Tube Fittings with Straight-Thread Connection

Flexible even at temperatures as low as -80° F, these fluorosilicone O-rings will keep your fittings free from leaks. They’re often used on fuel and coolant hose because fluorosilicone resists many chemicals, including ethanol and ethylene glycol.

High-Temperature Soft Silicone O-Rings

Able to withstand temperatures up to 400° F, these O-rings are softer than standard silicone O-rings for a better seal in low-pressure applications.

High-Temperature Metal-Detectable Silicone O-Rings

If these O-rings deteriorate, they can be picked up by metal detection systems.

Water- and Steam-Resistant EPDM O-Rings

These O-rings also resist ethanol and ethylene glycol.

Made-to-Order Water- and
Steam-Resistant EPDM O-Rings

When you need an O-ring that’s not an industry standard size, we can make one to fit your requirements.

Water- and Steam-Resistant
High-Temperature EPDM O-Rings

These O-rings withstand higher temperatures than standard EPDM O-rings.

Water- and Steam-Resistant
Food Industry EPDM O-Rings

Made of FDA-listed material for use with food and beverage.

Water- and Steam-Resistant EPDM O-Rings for
Tube Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

Water-Resistant Neoprene O-Rings

These O-rings also resist ammonia, ethylene glycol, and isopropyl alcohol.

Water-Resistant Neoprene O-Rings for Tube
Fittings with Straight-Thread Connection

Also known as Boss O-rings, these O-rings are for use in tube fittings with a straight-thread connection.

O-Ring Cord Stock

Metal-Detectable High-Temperature
Silicone O-Ring Cord Stock

Create round-profile O-rings for sealing applications near ovens and other hot areas in your food plant.

Water-Resistant Soft Neoprene O-Ring Cord Stock

This soft cord stock creates a better seal in low-pressure applications that standard neoprene cord stock.

Water-Resistant Neoprene O-Ring Cord Stock

Use neoprene cord stock to make O-rings for applications that come into contact with water.

Water- and Steam-Resistant EPDM O-Ring Cord Stock

In addition to water and steam, this EPDM cord stock resists diluted salt solutions, ethanol, and isopropyl alcohol.

O-Ring Assortments

Water- and Steam-Resistant O-Ring Assortments

In addition to water and steam, these EPDM O-Rings resist ethanol and ethylene glycol.

Water- and Steam-Resistant and
High-Temperature O-Ring Assortments

These assortments include a mix of EPDM O-rings that resist water and steam and silicone O-rings that resist temperatures up to 450° F.

O-Ring Bonding Kits

These kits include everything you need to make your own Buna-N, fluoroelastomer, or EPDM O-rings.

Surface-Mount Rubber Seals

Water- and Weather-Resistant Hollow
Foam Rubber Surface-Mount Seals

Made of EPDM foam rubber, these seals have hollow construction for more compressibility than solid seals.

Water- and Weather-Resistant
Foam Rubber Surface-Mount Seals

These seals are made of solid EPDM foam rubber.

Water- and Weather-Resistant
Hollow Rubber Surface-Mount Seals

Hollow construction makes these seals more compressible than solid rubber seals. Made of EPDM rubber, they also resist salts.

Water-Resistant Hollow Rubber Surface-Mount Seals

Made of vinyl rubber, these seals also resist salts and detergents. Hollow construction provides compressibility.

Water- and Weather-Resistant
Rubber Surface-Mount Seals

These solid EPDM rubber seals also resist salts.

High-Temperature Hollow Rubber Surface-Mount Seals

The hollow construction on these seals provides better compressibility than solid rubber seals. Made of silicone rubber, they also resist water and salts.

High-Temperature Fire-Rated
Hollow Rubber Surface-Mount Seals

Tested in accordance with UL and NFPA standards, these silicone rubber seals are for use on fire-rated doors.

High-Temperature Rubber Surface-Mount Seals

These solid silicone rubber seals also stand up to water and salts.

High-Temperature Foam Rubber Surface-Mount Seals

Made of solid silicone foam rubber, these seals also resist water and salts.

High-Temperature Hollow Foam
Rubber Surface-Mount Seals

It’s the hollow construction that makes these seals more compressible than solid seals. Made of silicone foam rubber, they also resist water and salts.

Push-On Rubber Seals

Water- and Weather-Resistant Hollow Foam
Rubber Push-On Seals with Bulb on Side

More compressible than seals with a solid bulb, these seals have a hollow bulb.

Water- and Weather-Resistant Foam
Rubber Push-On Seals with Bulb on Side

These seals have a solid bulb.

Oil-Resistant Push-On Seals with Bulb on Side

In addition to oil, these seals resist grease, salts, water, steam, and most detergents.

High-Temperature Push-On Seals with Bulb on Side

Able to withstand temperatures up to 500° F, these all-rubber silicone seals resist water and salts.

Water- and Weather-Resistant Hollow Foam
Rubber Push-On Seals with Bulb on Top

These seals have an EPDM foam rubber bulb.

Oil-Resistant Rubber Push-On Seals with Bulb on Top

The Buna-N foam rubber bulb on these seals also resists grease, salts, water, steam, and most detergents.

Water- and Weather-Resistant Rubber
Push-On Seals with Rubber Wiper

The EPDM rubber wiper is firmer and more durable than the EPDM foam rubber wipers.

Water- and Weather-Resistant Rubber
Push-On Seals with Foam Rubber Wiper

These seals have an EPDM foam rubber wiper, which is softer and more flexible than EPDM rubber wipers.

High-Temperature Push-On Seals with Wiper

Made of silicone rubber, these seals can handle temperatures up to 500° F, plus they resist water and salts.

Water- and Weather-Resistant Push-On T-Seals

Push these T-seals into grooves and channels to block out moisture, dust, and debris.

Water-and Weather-Resistant Push-On H-Seals

Use these H-seals to lock out moisture, dust, and debris around windows and panels.

Push-On Seals with Glass Locking Slot

Seal stationary windows into place with these EPDM seals. EPDM resists water, sunlight, and ozone.

Flange-Mount Rubber Seals

Water- and Weather-Resistant
Hollow Rubber Flange-Mount Seals

Firmer and more durable than EPDM foam rubber seals, these seals are made of EPDM rubber. They also resist salts.

Water-Resistant Hollow Rubber Flange-Mount Seals

Hollow construction on these vinyl rubber seals provides better compressibility than seals with a foam core. They also resist salts and detergents.

Water-Resistant Rubber Flange-Mount Seals

The foam core makes these vinyl rubber seals firmer and more durable than hollow seals. They also resist salts and detergents.

Water- and Weather-Resistant
Foam Rubber Flange-Mount Seals

Softer and more flexible than EPDM rubber seals, these EPDM foam rubber seals will effortlessly conform to uneven surfaces.

High-Temperature Rubber Flange-Mount Seals

These seals have solid construction.

High-Temperature Hollow Rubber Flange-Mount Seals

Hollow construction makes these seals more compressible than solid seals.

High-Temperature Foam Rubber Flange-Mount Seals

These seals have solid construction.

High-Temperature Hollow Foam
Rubber Flange-Mount Seals

These hollow seals offer better compressibility than solid seals.

Ultra High-Temperature Rope Edge Seals

Square-Profile Ultra
High-Temperature Rope Edge Seals

The flat edges on these square-profile seals provide more sealing surface than round-profile seals. They’re made of 98% silica to resist temperatures up to 2300° F.

Round-Profile Ultra High-Temperature Rope Edge Seals

Made of 96% silica, these seals resist temperatures up to 1800° F.

Reciprocating Rod and Piston Seals

Buna-N U-Cup Seals

These U-cup seals create less friction than O-ring-loaded U-cups, so they wear more slowly. Also known as lip seals, U-cups have a sealing lip on both the inside and outside edges, so they can be used for rod and piston sealing.

High-Pressure Leather U-Cup Seals

Rated for pressure up to 10,000 psi, these leather U-cups handle over 80 times more pressure than our Buna-N U-cups.

High-Stability High-Speed Piston Seals

A square O-ring prevents these piston seals from rocking in the groove.

High-Speed Piston Seals

PTFE gives these seals a slippery surface that allows rod speeds more than two times faster than our other piston seals.

Piston Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

High-Pressure Piston Seals

Rated for pressure up to 10,000 psi, these seals withstand the highest pressure of our piston seals.

Rod Seals for O-Ring Grooves

Avoid common O-ring failure in dynamic applications—the square base of these seals prevents twisting, while backup rings protect against extrusion.

High-Speed Rod Seals

The slippery PTFE surface of these seals allows rod motion up to seven times faster than our other rod seals.

High-Speed Hydraulic Cylinder Buffering Seals

PTFE gives these seals a slippery surface that facilitates rod speeds over seven times faster than our other buffering seals. They're rated for pressure up to 5,000 psi.

Air-Powered Cylinder Cushioning Seals

For use in air-powered cylinders, these seals prevent the piston from slamming against the cylinder body to minimize wear and noise.

Rod-Sealing Wipers

A two-lip design means that these wipers also function as a rod seal.

High-Speed Rod Wipers

Made from MDS-filled PTFE for a slippery surface, these wipers allow rods to move three times faster than other rod wipers.

Rod Wipers for Open Grooves

Replace wipers in open-groove cylinders—these wipers have an integral steel case so they press fit into the groove around the rod.

Wear Rings

Made from glass-filled nylon for excellent wear resistance and strength.

Wear Ring Stock

Cut this stock to make wear rings that fit any rod or bore diameter.

High-Speed Wear Rings

Made from PTFE, these wear rings have a slippery surface that allows rods to move at least three times faster than nylon wear rings.

Rotary Shaft Seals

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip

Ribbed Buna-N over steel creates a tight seal with the bore, even when mating with a rough surface or in a split housing.

Spring-Loaded Rotary Shaft Seals with Wiper Lip

These seals have a metal case that creates a tight seal when mating with smooth surfaces.

Spring-Loaded Rotary Shaft Seals

Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. A spring secures the lip against the shaft, preventing messy leaks. Press-fit seals into the bore around the shaft.

Spring-Loaded Rotary Shaft Seals for Misaligned Shafts

Designed with an extended lip, these seals have the flexibility to accommodate shaft misalignment up to 0.125". They're also known as clipper seals.

Rotary Shaft Seals for Grease

Also known as grease seals, these are designed to retain thick lubricant at low pressure. They have a light grip on the shaft that creates less friction than spring-loaded seals.

High-Speed Rotary Shaft Seals

A slippery PTFE surface allows these seals to function at speeds at least 25% faster than other rotary shaft seals.

Split Rotary Shaft Seals

Swap out old seals without disassembling components—these seals come split for easy installation. They're also known as clipper seals.

Shaft-Mounted Rotary Seals

Made from Buna-N for excellent resistance to oil and grease.

Heavy Duty Shaft-Mounted Rotary Seals

These seals are fluoroelastomer, so they have excellent chemical resistance and withstand temperatures up to 390° F.

Mechanical Pump Shaft Seals with Extended Spring

An extended spring on these seals accommodates variations in seal cavity length and pump misalignment.

Mechanical Pump Shaft Seals

These seals are commonly used in well, sump, and displacement pumps.

Heavy Duty Mechanical Pump Shaft Seals

Multiple internal springs ensure these seals keep the sealing surfaces in contact in demanding applications, such as agricultural, chemical, and mining pumps.

Mechanical Shaft Seals

Commonly used in mixing and grinding equipment, conveyors, and construction machinery, these two-part seals withstand exposure to abrasive material.

Packing Seals

Hard Chemical-Resistant Packing Seals

These seals are made of PTFE fiber without a lubricant, so they’re harder than other chemical-resistant packing seals to handle high-pressure valve applications.

Abrasion- and Chemical-Resistant Packing Seals

Aramid and PTFE fibers are blended for seals that resist chemicals and abrasion. Use these seals in pumps.

Heat-Shielding Chemical-Resistant Packing Seals

Also known as 100% GFO, these expanded PTFE seals contain graphite powder, which dissipates heat away from the shaft and allows pumps to run cool at high speeds.

High-Speed Chemical-Resistant Packing Seals

Built for high-speed pump and valve applications, these super-tough seals are made of expanded-graphite yarn with carbon-yarn corners.

Chemical-Resistant Packing Seals

These lubricated PTFE fiber seals stand up to most chemicals. Use them in pumps and valves.

High-Speed Steam-Resistant Packing Seals

Made of graphite-impregnated carbon, these steam-resistant seals dissipate heat from the shaft to protect pumps and valves when operating at high speeds.

Steam-Resistant Packing Seals

Use these graphite-impregnated graphite seals for steam applications in pumps and valves.

High-Flexibility Steam-Resistant Packing Seals

Offering excellent flexibility, these seals are made of expanded graphite yarn. Use them for steam applications in pumps and valves.

Wire-Reinforced Steam-Resistant Packing Seals

The Inconel-wire reinforcement in these expanded-graphite yarn seals ensures they keep their shape longer than the High-Flexibility Steam-Resistant Packing Seals. Use them for steam applications in valves.

Ultra-Sealable Oil- and Water-Resistant Packing Seals

Our most compressible packing seals, these require less pressure than any other to make an effective seal. They’re made of lubricated PTFE-impregnated aramid fiber and are for use in pumps.

Heat-Shielding Oil- and Water-Resistant Packing Seals

Synthetic yarn that’s comparable in strength to aramid is combined with graphite for soft seals that dissipate heat away from the shaft to extend the life of pumps.

Low-Friction Oil- and Water-Resistant Packing Seals

These seals require lighter packing pressure than standard oil- and water-resistant packing seals, so they cause less friction and reduce shaft wear. They’re made of graphite-impregnated aramid fiber and are for use in pumps and valves.

Oil- and Water-Resistant Packing Seals

Made of PTFE-impregnated synthetic fiber, these seals are for use in pumps.

Abrasion-, Oil-, and Water-Resistant Packing Seals

The most abrasion resistant of all our packing seals, these are made of PTFE-impregnated aramid fiber that has been saturated in a lubricant. They are for use in pumps.

Stackable V-Ring Packing Seals

High-Pressure Leather Stackable V-Ring Packing Seals

These leather V-ring packing seals handle over twice the pressure as PTFE. Leather is tough, pliable, and wear resistant, so it flexes to fit uneven surfaces and fill voids.

PTFE Stackable V-Ring Packing Seals

PTFE has excellent chemical resistance and withstands a wide temperature range of -110° F to 500° F.

Packing Seal Tape

For use in valves and pumps, this thin, flexible tape is made from high-purity graphite with no fibers or binders that could contaminate your process line.

Control of Liquids, Gases, and Solids

O-Rings for Brass Compression
Tube Fittings for Air and Water

Use these O-rings with brass compression tube fittings that have BSPP male threads. They create a seal on the BSPP male threads to guard against leaks.

Garden Hose Fitting Washers

Insert these washers in the threaded female end of a garden hose fitting to prevent leaks.

Inline Strainer Washers

Install these strainer washers in pipe or fittings to protect equipment in locations where other strainers don’t fit.

Sealants

Oil- and Fuel-Resistant Sealants

These non-sagging sealants will not drip while hardening on vertical and overhead surfaces.

Self-Leveling Oil- and Fuel-Resistant Sealants

Thinner than non-sagging sealants, these flow easily into cracks and have a smooth finish.

Chemical-Resistant Sealants

These non-sagging sealants will not drip while hardening on vertical and overhead surfaces.

Self-Leveling Chemical-Resistant Sealants

Thinner than non-sagging sealants, these flow easily into cracks and have a smooth finish.

About O-Rings

O-Rings

Oil-Resistant Buna-N O-Rings

Oil-Resistant Metal-Detectable Buna-N O-Rings

Chemical-ResistantLow-Temperature Fluorosilicone O-Rings for Tube Fittings with Straight-Thread Connection

High-Temperature Soft Silicone O-Rings

High-Temperature Metal-Detectable Silicone O-Rings

Water- and Steam-Resistant EPDM O-Rings

Made-to-Order Water- andSteam-Resistant EPDM O-Rings

Water- and Steam-ResistantHigh-Temperature EPDM O-Rings

Water- and Steam-ResistantFood Industry EPDM O-Rings

Water- and Steam-Resistant EPDM O-Rings forTube Fittings with Straight-Thread Connection

Water-Resistant Neoprene O-Rings

Water-Resistant Neoprene O-Rings for TubeFittings with Straight-Thread Connection

O-Ring Cord Stock

Metal-Detectable High-TemperatureSilicone O-Ring Cord Stock

Water-Resistant Soft Neoprene O-Ring Cord Stock

Water-Resistant Neoprene O-Ring Cord Stock

Water- and Steam-Resistant EPDM O-Ring Cord Stock

O-Ring Assortments

Water- and Steam-Resistant O-Ring Assortments

Water- and Steam-Resistant andHigh-Temperature O-Ring Assortments

O-Ring Bonding Kits

O-Ring Bonding Kits

Surface-Mount Rubber Seals

Water- and Weather-Resistant HollowFoam Rubber Surface-Mount Seals

Water- and Weather-ResistantFoam Rubber Surface-Mount Seals

Water- and Weather-ResistantHollow Rubber Surface-Mount Seals

Water-Resistant Hollow Rubber Surface-Mount Seals

Water- and Weather-ResistantRubber Surface-Mount Seals

High-Temperature Hollow Rubber Surface-Mount Seals

High-Temperature Fire-RatedHollow Rubber Surface-Mount Seals

High-Temperature Rubber Surface-Mount Seals

High-Temperature Foam Rubber Surface-Mount Seals

High-Temperature Hollow FoamRubber Surface-Mount Seals

Push-On Rubber Seals

Water- and Weather-Resistant Hollow FoamRubber Push-On Seals with Bulb on Side

Water- and Weather-Resistant FoamRubber Push-On Seals with Bulb on Side

Oil-Resistant Push-On Seals with Bulb on Side

High-Temperature Push-On Seals with Bulb on Side

Water- and Weather-Resistant Hollow FoamRubber Push-On Seals with Bulb on Top

Oil-Resistant Rubber Push-On Seals with Bulb on Top

Water- and Weather-Resistant RubberPush-On Seals with Rubber Wiper

Water- and Weather-Resistant RubberPush-On Seals with Foam Rubber Wiper

High-Temperature Push-On Seals with Wiper

Water- and Weather-Resistant Push-On T-Seals

Water-and Weather-Resistant Push-On H-Seals

Push-On Seals with Glass Locking Slot

Flange-Mount Rubber Seals

Water- and Weather-ResistantHollow Rubber Flange-Mount Seals

Water-Resistant Hollow Rubber Flange-Mount Seals

Water-Resistant Rubber Flange-Mount Seals

Water- and Weather-ResistantFoam Rubber Flange-Mount Seals

High-Temperature Rubber Flange-Mount Seals

High-Temperature Hollow Rubber Flange-Mount Seals

High-Temperature Foam Rubber Flange-Mount Seals

High-Temperature Hollow FoamRubber Flange-Mount Seals

Ultra High-Temperature Rope Edge Seals

Square-Profile UltraHigh-Temperature Rope Edge Seals

Round-Profile Ultra High-Temperature Rope Edge Seals

Reciprocating Rod and Piston Seals

Buna-N U-Cup Seals

High-Pressure Leather U-Cup Seals

High-Stability High-Speed Piston Seals

High-Speed Piston Seals

Piston Seals for O-Ring Grooves

High-Pressure Piston Seals

Rod Seals for O-Ring Grooves

High-Speed Rod Seals

High-Speed Hydraulic Cylinder Buffering Seals

Air-Powered Cylinder Cushioning Seals

Rod-Sealing Wipers

High-Speed Rod Wipers

Rod Wipers for Open Grooves

Wear Rings

Wear Ring Stock

High-Speed Wear Rings

Rotary Shaft Seals

Bore-Sealing Spring-LoadedRotary Shaft Seals with Wiper Lip

Spring-Loaded Rotary Shaft Seals with Wiper Lip

Chemical-Resistant
Low-Temperature Fluorosilicone O-Rings for
Tube Fittings with Straight-Thread Connection

Made-to-Order Water- and
Steam-Resistant EPDM O-Rings

Water- and Steam-Resistant
High-Temperature EPDM O-Rings

Water- and Steam-Resistant
Food Industry EPDM O-Rings

Water- and Steam-Resistant EPDM O-Rings for
Tube Fittings with Straight-Thread Connection

Water-Resistant Neoprene O-Rings for Tube
Fittings with Straight-Thread Connection

Metal-Detectable High-Temperature
Silicone O-Ring Cord Stock

Water- and Steam-Resistant and
High-Temperature O-Ring Assortments

Water- and Weather-Resistant Hollow
Foam Rubber Surface-Mount Seals

Water- and Weather-Resistant
Foam Rubber Surface-Mount Seals

Water- and Weather-Resistant
Hollow Rubber Surface-Mount Seals

Water- and Weather-Resistant
Rubber Surface-Mount Seals

High-Temperature Fire-Rated
Hollow Rubber Surface-Mount Seals

High-Temperature Hollow Foam
Rubber Surface-Mount Seals

Water- and Weather-Resistant Hollow Foam
Rubber Push-On Seals with Bulb on Side

Water- and Weather-Resistant Foam
Rubber Push-On Seals with Bulb on Side

Water- and Weather-Resistant Hollow Foam
Rubber Push-On Seals with Bulb on Top

Water- and Weather-Resistant Rubber
Push-On Seals with Rubber Wiper

Water- and Weather-Resistant Rubber
Push-On Seals with Foam Rubber Wiper

Water- and Weather-Resistant
Hollow Rubber Flange-Mount Seals

Water- and Weather-Resistant
Foam Rubber Flange-Mount Seals

High-Temperature Hollow Foam
Rubber Flange-Mount Seals

Square-Profile Ultra
High-Temperature Rope Edge Seals

Bore-Sealing Spring-Loaded
Rotary Shaft Seals with Wiper Lip

O-Rings for Brass Compression
Tube Fittings for Air and Water