Product Description Ideal for plumbing system tests. Easy to install with extra-large wing nut. Inside of pipe seals inside pipe as far as needed From the Manufacturer Cherne Gripper Mechanical Plugs are ideal for plumbing system tests. They're easy to in

Product Description Ideal for plumbing system tests. Easy to install with extra-large wing nut. Inside of pipe seals inside pipe as far as needed From the Manufacturer Cherne Gripper Mechanical Plugs are ideal for plumbing system tests. They're easy to install with an extra-large wing nut. The inside of the pipe seals inside pipe as far as needed. Plugs are made with glass-reinforced ABS plastic. End-of-pipe seals only at the end of a pipe, preventing plug from falling into stack.