Rubber Hole Plugs | McMaster-Carr

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3,739 Products

Building and Machinery Hardware

Protective Plugs

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

372 products

Protective Caps

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

138 products

Grommets

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

583 products

Bumpers

Absorb impact to protect equipment and surfaces from dents and scuffs

213 products

Vibration-Damping Mounts

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

63 products

Fluid Handling

Expansion Plugs

Seal pipe and tubing lines when checking for leaks

343 products

Drain Valves

Vent air or discharge liquids to remove excess fluid from your system

5 products

Pipe and Pipe Fittings

Generally thicker and more rigid than tubing for distributing liquids and gases through your facility

244 products

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

96 products

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

159 products

Pressure Test Fittings

Create a temporary connection point for gauges and other testing equipment

28 products

Breather Vents

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

22 products

Electrical

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

1 product

Electrical Enclosure Drain Vents

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

5 products

Cord Grips

Securely connect cords to enclosures while sealing out dirt and moisture

1,109 products

Cable Entry Panels

Pass multiple cords into an enclosure while sealing out moisture, dust, and other contaminants

83 products

Data Port Plugs

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

2 products

Electrical Connector Caps

Protect data connectors when not in use

34 products

Capacitor Boots

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

3 products

Fastening and Joining

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

Safety Equipment

Earplugs

Protect your hearing in loud environments without the bulk of earmuffs

12 products

Floor Drain Plugs

Prevent oil and other spills from going down your floor drain

3 products

Spill-Control Drain Covers

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

6 products

Facility and Grounds Maintenance

Floor Drain Trap Seals

Stop sewer gases from escaping through rarely used floor drains if the P-trap dries out

4 products

Drain Check Valves

Prevent water damage by placing into floor drains to stop sewer back-ups

3 products

Sink Drain Stoppers

Plug drains to fill up sinks and tubs

4 products

Containers, Storage, and Furniture

Drum Plugs

Seal drum lid openings

10 products

Drum Locks

Secure drum lids and openings to prevent tampering

1 product

Lubricating

Grease Fitting Caps

Protect grease fittings from dirt, debris, and moisture

1 product