This Oatey Gripper 4-inch mechanical test plug is designed to securely seal piping systems for pressure testing or temporary closure. It features a corrosion-resistant plastic body, high-strength ABS glass-reinforced plates, and a natural rubber O-ring that provides excellent expansion for a leak-proof seal. The tool-free design includes an extra-large zinc wing nut and a galvanized carriage bolt for easy manual tightening and removal. Rated for up to 17 PSI or 40 feet of head pressure, this end-of-pipe plug is ideal for various plumbing maintenance and testing applications

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