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Lead Free Poly Alloy Plastic Plugs are used to plug the end of PEX water lines to pressure or air test, or keep debris out. Manufactured to ASTM F2159, F1960, F877 and CAN/CSA B137.5 standards. This PEX fitting may be used with the stainless steel clamping system or the crimp ring system. For Potable Water Distribution and Hydronic Heating applications, new construction or professional plumbing. Very Fast and Easy. Low cost plumbing connection system, durability and reliability. Resists corrosion and scale build up. Eliminates need for solvents, chemicals, solder and flame. No waiting for glue to dry or joints to cool. No soldering, no threading and no waiting.