3/8 in Merchant Steel Coupling, Sch. 40 Galvanized Pipe Fitting, Class 150 - GP13038 - Hi-Line Inc.
38COUP-10 3/8" Black Pipe Couplings Steel Pipe Fitting | National Fire Supply
Brass Pipe Fittings, Water Hose Adapter, G 1/2 Female to G 3/8 Male Reducer Adapter, Compression Fitting for Kitchen Bathroom Faucet, Pipe Connector with Rubber Washer,(2 Pack) - Amazon.com