Rubber Caps | McMaster-Carr

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Material

Hastelloy C276 Nickel

Tube Material

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UN/UNF (SAE Straight)

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Reflective Orange/Reflective White

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Quick-Disconnect Component

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DFARS Specialty Metals

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3,882 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

933 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 Plugs

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

227 products

Pipe Caps

Cover the ends of pipe to keep out dirt and debris

17 products

Pipe Flanges

Create an access point in a line by bolting two same-size flanges together with a gasket

31 products

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

343 products

Air Vent Valves

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

2 products

Sights

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

149 products

Thermocouple Connector Covers

Shield thermocouple connectors from dust and debris

1 product

Breather Vents

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

22 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

T-Slotted Framing and Fittings

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

38 products

Strut Channel Framing and Fittings

Secure fittings in the U-shaped channel to route conduit and pipe or build other structures

1 product

Protective Feet

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

85 products

Vibration-Damping Mounts

Attach to machinery to reduce vibration and noise and extend service life

52 products

Hand Grips

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

59 products

Knobs

Position, tighten, and secure fixtures and equipment

8 products

Grommets

Protect wire, cable, and cords from holes with sharp or rough edges

11 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

Electrical Sockets

Pair with plugs or receptacles to transmit power or data

122 products

Electrical Plugs

Pair with sockets or receptacles to transmit power or data

114 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

15 products

Wire Tap/Connectors

Tap and splice multiple wires together at the same time

5 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

5 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

Press-Fit Nuts

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

2 products

Threaded Inserts

Create new threads or repair stripped threads

1 product

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

Containers, Storage, and Furniture

Fuel Caps

Seal fuel tanks on trailers, compressors, and other equipment

2 products

Drum Plugs

Seal drum lid openings

10 products

Drum Lids

Replace the lid on your drum

16 products

Drum Locks

Secure drum lids and openings to prevent tampering

1 product

Safety Equipment

Clothing Kits

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

1 product

Hard Hat Chin Straps

Hold your hard hat securely in place

3 products

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

12 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

Traffic Posts

Taller than cones to divide lanes of traffic and form barriers

7 products

Lubricating

Grease Fittings

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

4 products

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

1 product

Facility and Grounds Maintenance

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

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