Air Test Plugs | McMaster-Carr

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50 ft. of head to 99 ft. of head

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250 ft. of head or greater

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356 Products

Expansion Plugs

Air-Inflatable Plugs

Also known as pneumatic plugs, these plugs conform to wide and out-of-round pipes.

Air- and Water-Inflatable Plugs

Penetrate tight pipe junctures with the most flexible expansion plugs we offer.

Air- and Water-Inflatable Plugs for Wye-Joints

These extra-long plugs allow you to seal off two pipes at the same time. They have two separate inflation chambers to release back pressure gradually and prevent splash back as water clears the drain line.

Air-Inflatable Plugs for Tee Connections

Often used for plumbing tests, these plugs thread into tees and inflate to block flow across the pipe.

Remote-Access Air-Inflatable Plugs

Plug underground sewage lines, water supply lines, and other pipe that’s hard to reach. These plugs connect to a 6-ft. extension pole with an adapter so you can place them in confined spaces from a distance.

Air-Inflatable Plugs with Bypass

Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve back pressure while testing.

Hex-Nut Expansion Plugs

Tighten the nut on these plugs to expand the seal.

Wing Nut Expansion Plugs

Twist the wing nut on these plugs to expand the seal.

T-Handle Expansion Plugs

Twist the easy-grip T-handle on these plugs to expand the seal.

Quick-Snap Expansion Plugs

Turn the cam handle to expand the seal, then snap the handle down to hold it in place.

Square-Head Expansion Plugs

Turn the square head of the plug into the sealing ring to close off pipe openings.

Expansion Plugs with Bypass

Use the bypass tube on these plugs to add air, water, and other fluid to your pipeline or to relieve pressure while testing.

Deep-Reach Hex Nut Expansion Plugs with Bypass

Use the bypass tube to add air, water, and fluid or relieve back pressure.

Deep-Reach Wing Nut Expansion Plugs

Insert these plugs deep within your pipe to temporarily block off a line. Twist their wing nut to expand the seal.

Expansion Plugs for Cleanout Tees

Seal cleanout tees when testing your drain, waste, and vent systems for pressure and leaks—no need to inflate these plugs with an air compressor or hand pump.

Pressure Test Fittings

Quick-Install Pressure Test Fittings

Tighten these threaded fittings with your hands for a secure connection in testing, flushing, venting, and plugging applications—no tools, tape, or sealant required.

Pressure Test Fittings

Check pressure without permanently installing a gauge.