Southland 1-1/2 in. Galvanized Malleable Iron FPT x FPT Coupling Fitting 511-207HN - The Home Depot
Pipe Fittings Direct. 3 1/2 inch NPT weld on mechant steel half coupling, Class 150, Internal Thread X Butt Weld
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