1" X 1/2" Stainless Steel Threaded Reducing Coupling
Sigma ProConnex 1/2-in Zinc-plated Steel Threaded Coupling Conduit Fittings in the Conduit Fittings department at Lowes.com
304 Stainless Steel, 1/4 in x 1/4 in Fitting Pipe Size, Coupling - 1LRY6|40FC111N014 - Grainger
1/2" Short Threaded Coupling - Steel | Garvin Industries
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