Pneumatic Test Plugs | McMaster-Carr

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326 Products

Expansion Plugs

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.

Quick-Snap Expansion Plugs

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

T-Handle Expansion Plugs

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

Square-Head Expansion Plugs

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

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.

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.

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.

Pressure Test Fittings

Check pressure without permanently installing a gauge.

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.