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Oatey Knock-Out Test Caps are a solvent weld test cap designed for use on Schedule 40 ABS or PVC DWV piping for testing up to 17 PSI or 40' head pressure. The Knock-Out Test Cap's deep design provides a strong, leak-free connection, while "tab" feature keeps hands free from solvent cement. Knock-Out center of test cap can be removed with "tab" to prevent possible blockage in piping.