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
Megairon 2" NPT Male x 2" NPT Male Threaded Coupling,Stainless Steel SS304 Cast Pipe Fitting,Nipple - Amazon.com