3/4" x 1/2" FIP Stainless Steel Pipe Reducer Coupling at Menards®
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316 Stainless Steel, 3/4 in x 1/2 in Fitting Pipe Size, Reducing Adapter - 14M046|12-8 RA-SS - 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