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2 PIECES XFITTING 1/2" PEX X 1/2" PB (POLYBUTYLENE) SPLICING COUPLING WITH RING, REPAIR KIT, BRASS - Amazon.com
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SharkBite 1/2-in PEX Crimp x 1/2-in Polybutylene Brass Transition Coupling in the PEX Pipe, Fittings & Specialty Tools department at Lowes.com
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