Horiznext npt 1/2-3/4 male to female thread reducer adapter, stainless steel connector for plumbing,shower hose, sink faucet, tub, air water gas line(2 pcs) - Amazon.com
316 Stainless Steel, 1 1/2 in x 3/4 in Fitting Pipe Size, Hex Reducing Bushing - 1RTW2|1RTW2 - Grainger
Horiznext male thread reducer, stainless steel 304 hex pipe fitting, npt 1" to NPT 3/4" adapter, 1-1/4 to 1 inch o.d. water connector (Pack of 2) - Amazon.com