Rubber Caps | McMaster-Carr

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4,332 Products

Fluid Handling

Hose End Caps

Cover the ends of hose to keep out dirt and debris

133 products

Hose Fittings

Create threaded, barbed, quick-disconnect, and other types of connections between lengths of hose

930 products

Hose End Plugs

Insert into the ends of hose to keep out dirt and debris

13 products

Tube End Caps

Cover the ends of tube to keep out dirt and debris

54 products

Tube Fittings

Make threaded, push to connect, barbed, and other types of connections between lengths of tube

425 products

Tube End Plugs

Insert into the ends of tube to keep out dirt and debris

41 products

Pipe and Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases

275 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

335 products

Air Vent Valves

Eliminate air pockets from fluid lines to maintain consistent flow and prevent surges

2 products

Thermocouple Connector Covers

Shield thermocouple connectors from dust and debris

1 product

Sights

Observe and monitor the contents of pipes, tanks, and other containers

149 products

Breather Vents

Maintain even pressure and vacuum as temperatures change by allowing airflow in tanks and enclosures

26 products

Building and Machinery Hardware

Protective Caps

Protect just about anything, including pipe, flanges, screws, and posts

138 products

Protective Plugs

Insert into holes in pipe, containers, panels, and parts to keep out debris

372 products

Hand Grips

Cover handles so they're more comfortable and secure to hold

116 products

Protective Feet

Add to furniture and light equipment to protect floors from scratches and wear

172 products

Knobs

Position, tighten, and secure fixtures and equipment

66 products

Strut Channel Covers

Close off the channel to create a raceway for cable or add a finished look

1 product

T-Slotted Framing and Fittings

The most versatile system, attach fittings along the continuous slots to build virtually anything

38 products

Electrical

Electrical Connector Caps

Protect data connectors when not in use

34 products

Data Port Plugs

Keep dust, debris, and moisture out of unused computer ports

2 products

Metric Circular Adapters

Join connectors of different sizes, configurations, or types

9 products

Power Connectors

Plugs, sockets, receptacles, and other connectors for powering equipment

221 products

Latching Connectors

Protect connections in wet or harsh environments while keeping them accessible

9 products

D-Sub Connectors

Plugs, sockets, and receptacles for connecting computers, monitors, and printers

8 products

Welding Cable Connectors

Plugs and sockets to deliver power to welding cable

9 products

Han Connectors

Stackable plugs and sockets to make Han connections

2 products

Mini Adapters

Create a branch off a main cord or connect multiple devices with mini connections to a single port

5 products

Metric Circular Cords

Send power and signal to equipment with metric connections

289 products

Wire Splices, Connectors, and Taps

Join wire and protect the connection

8 products

Electrical Enclosure Plugs

Block or seal holes in outlet boxes and enclosures to keep out debris, dust, and moisture

1 product

Electrical Enclosure Vents

Attach to sealed enclosures so air can flow to equalize temperature and pressure

10 products

Electrical Enclosure Drain Vents

Prevent moisture from getting trapped inside enclosures while letting air flow through

5 products

Cold-Shrink Tubing End Caps

Seal crimped electrical connections without heat or tools to protect against moisture

4 products

Outlet Boxes

House electrical components such as on-off switches, receptacles, and dimmer knobs

2 products

Capacitor Boots

Shield capacitors and wire connections to extend their service life and reduce accidental shocks

3 products

Fastening and Joining

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

18 products

Threaded Inserts

Create new threads or repair stripped threads

1 product

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

2 products

Socket Retaining Rings

Secure sockets and adapters to impact tools

3 products

Fabricating and Machining

Clamp Holding Screw Tips

Cover metal holding screws to protect workpieces from scratches

10 products

Clamp Holding Screws

Replace worn holding screws in clamps or customize with different sizes or styles

43 products

Tweezer Tip Caps

Protect tweezer tips from damage

1 product

Jaw Covers for Pliers

Cover the jaws of slip-joint pliers to protect the finish of your workpiece

2 products

Vise Jaw Liners

Place over vise jaws to protect workpieces from marring

7 products

Fixture Plate Plugs

Keep chips and shavings from clogging or damaging unused holes on fixture plates in milling machines

3 products

Containers, Storage, and Furniture

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

2 products

Drum Plugs

Seal drum lid openings

16 products

Drum Locks

Secure drum lids and openings to prevent tampering

1 product

Drum Lids

Replace the lid on your drum

16 products

Facility and Grounds Maintenance

Protective Coatings

Shield surfaces from the surrounding environment

1 product

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

4 products

Safety Equipment

Clothing Kits

Head-to-toe protection from electrical arc flashes, chemical splashes, welding sparks, and more

1 product

Hard Hat Liners

Layer under your hard hat for extra warmth

1 product

Toe Guards

Slip over shoes or boots to shield feet and toes from impact

6 products

Earplugs

Protect your hearing in loud environments without the bulk of earmuffs

16 products

Spill-Control Drain Covers

Block grates and manholes so liquid can't get in and odors can't get out

6 products

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Lubricating

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

1 product

Grease Fittings

Create an inlet on equipment and machinery for injecting lubricant; also known as Zerk fittings

4 products

Sealing

Drum Plug Gaskets

Form a tighter seal in drum openings than with a drum plug alone

5 products

Drum Gaskets

Seal lids onto steel and stainless steel drums

6 products

Heating, Ventilation, and Air Conditioning

Duct End Caps

Close off a length of duct

5 products