This Oatey 33403 Gripper 4-inch mechanical test plug is designed for sealing the open ends of piping systems during pressure and DWV testing. Constructed with durable glass-reinforced ABS plastic plates and a natural rubber O-ring, it provides a leak-free expansion seal rated for up to 17 PSI or 40 feet of head pressure. It features a galvanized carriage bolt and an extra-large wing nut for quick, secure manual tightening without tools. This item is in used-fair condition, showing visible signs of prior use but remaining completely functional for plumbing applications

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