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Amazon.com: Watts ANKA (ARSC112) 1" x 1/2" High Pressure Poly-Pipe Reducing Straight Coupling Insert, Fitting : Industrial & Scientific
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HOME-FLEX 1-1/2 in. IPS DR 11 Underground Yellow Poly Gas Pipe Coupler 18-429-015 - The Home Depot
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OEM SDR11, SDR17, SDR9 PE HDPE Pipe Fittings Butt Fusion Reducing Coupling HDPE Reducer for Water Supply and Gas - China HDPE Fitting, HDPE Pipe | Made-in-China.com