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Proline Series 1/2-in x 3/8-in Threaded Male Adapter Bushing Fitting in the Brass Fittings department at Lowes.com
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Brass Pipe Fitting Reducer Adapter, 1/2" NPT Male x 3/8" NPT Female for Water Oil Air Pressure Gauge Temp Sensor - Walmart.com
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Amazon.com: FasParts 1/2" Female NPT to 3/8" Female NPT FIP FPT Reducing Coupling Brass Pipe Fitting Fuel/Air/Water/Boat/Gas/Oil WOG : Industrial & Scientific
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1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack)
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Everbilt 1/2 in. x 3/8 in. Copper Pressure Cup x MIP Male Adapter Fitting C604HD1238 - The Home Depot
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