316L Stainless Steel, 1/2 in x 3/4 in Fitting Pipe Size, Concentric Reducer Coupling - 1RTA8|4381012400 - Grainger
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Merit Brass - Pipe Reducer: 2-1/2 x 2″ Fitting, 304 Stainless Steel - 33094970 - MSC Industrial Supply
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Amazon.com: Male Hex Nipple Threaded Reducer Connector Pipe Fitting Adapter,Stainless Steel 304 NPT (2" x 1-1/2") : Industrial & Scientific
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