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Ideal for plumbing system tests Easy to instal with extra-large wing nut Inside of pipe seals inside pipe as far as needed Made with glass-reinforced ABS plastic Ideal for plumbing system tests. Easy to instal with extra-large wing nut. Inside of pipe seals inside pipe as far as needed. Made with glass-reinforced ABS plastic. End-of-pipe seals only at the end of a pipe preventing plug from falling into stack.Cherne Gripper Mechanical Plugs are ideal for plumbing system tests. They’re easy to instal 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.