Oatey Oatey Cherne 270288 Gripper 8-inch Inside of Pipe Plug Ideal for plumbing system tests. Easy to install 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. Ideal for plumbing system tests Easy to install with extra-large wing nut Inside of pipe seals inside pipe as far as needed Made with glass-reinforced ABS plastic