Pipe Fittings Direct. 1 inch mechant steel full coupling, Class 150, Internal Thread X Internal Thread
Lasco 1 inch Coupling - FPT x FPT - Par West Turf
Calbrite Coupling, Rigid, 1-1/2in, 2-3/32inL, 316 SS S61500CP00 | Zoro
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