1-1/2 in Merchant Steel Coupling, Sch. 40 Galvanized Pipe Fitting, Class 150 - GP130112 - Hi-Line Inc.
1 1/2" Schedule 80 PVC Coupling Socket, 829-015
Horiznext npt 1/2 (means the inner diameter of the thread is 3/4 inch) cast female taper threaded pipe coupling, stainless steel 304 coupler for mush tun cooler and shower hose, 2 pcs - Amazon.com
Buy 1-1/2" Sch 40 Long Socket Coupling Slip x Slip (428-015)
1-1/2 in. PVC External Coupling (Box of 50) — FORMUFIT Direct
The Plumber's Choice 1/2 in. Straight Coupling Pipe Fittings Push to Connect PEX Copper CPVC Brass (5-Pack) 125UPSC - The Home Depot