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
Value Collection - Black Coupling: 2″, Threaded - 36995041 - MSC Industrial Supply
BMI USA Malleable Iron Pipe Coupling 2-COUPLING Hydraulic Supply Co.
Smith Cooper 3000# Forged Carbon Steel 2 in. Coupling Fitting - Threaded - John M. Ellsworth Co. Inc.