CHENJIN Pipe Coupling 3/4 Inch Female Threaded Pipe Coupler 2PCS 304 Stainless Steel Pipe Straight Connector Cast Fitting Water Gas Straight Adapter Jointer (Length 1.22") - Amazon.com
NEW B&K 4" INCH GALVANIZED PIPE THREADED COUPLING FITTING PLUMBING 1532613 | eBay
Horiznext 3/4 npt Stainless Steel fitting, home brew adapter female threaded pipe cast coupling for plumbing tubing shower hose water heating extender: Amazon.com: Industrial & Scientific
Smith Cooper 150# Black Malleable Iron 1 in. Banded Coupling Pipe Fittings - Threaded - John M. Ellsworth Co. Inc.
Anvil 8700157954, Steel Pipe Fitting, Coupling, 1/4" NPT Female, Black Finish: Amazon.com: Tools & Home Improvement
Made in USA 2" Galvanized Malleable Iron Pipe Coupling (Right Hand) Threaded Ends, 300 Liquid & Gas psi, 150 Steam psi 2.NMC - 36990398 - Penn Tool Co., Inc