What is the maximum back pressure that these plugs can hold?

They can hold a maximum back pressure of 24 ft of head.

What is air back pressure?

Air back pressure is the amount of pressure a plug can withstand without moving.

They are ideal for creating low-pressure seals in circular openings.

Turn-Tite mechanical expansion plugs from Shaw aid in repair & testing of water, sewer and plumbing systems.

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Style	Model	Nominal Size	Inside Dia.	Max. Air Pressure	Type	Material	Price (inc. GST)
A	52401	1"	0.937" To 1.031"	Up To 10 psi	Turn-Tite	Stainless Steel, Neoprene Rubber	SGD 67.84
A	52496	1/2"	0.48" To 0.528"	Up To 10 psi	Turn-Tite	Stainless Steel, Neoprene Rubber	SGD 166.01
A	52498	3/4"	0.719" To 0.791"	Up To 10 psi	Turn-Tite	Stainless Steel, Neoprene Rubber	SGD 171.65
A	52497	5/8"	-	-	Turn-Tite	Stainless Steel, Neoprene Rubber	SGD 164.04
A	52499	7/8"	0.812" To 0.893"	Up To 10 psi	Turn-Tite	Stainless Steel, Neoprene Rubber	SGD 170.34

These plugs have an easy-grip T-handle that expands the seal to close off pipe openings.

These plugs feature stainless steel construction and are intended for pipes with internal diameters ranging from 0 to 1 inch.
They have a chemical-resistant neoprene rubber seal that absorbs shock and protects against the ingress of water & dust.
The Turn-Tite T-handle provides an excellent grip to fasten the expanding plug into a hole.