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
Smith Cooper 3000# Forged Carbon Steel 3/4 in. Coupling Fitting - Threaded - John M. Ellsworth Co. Inc.