1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Amazon.com
Adapter Male 1/2" Female 3/8" (LP)
Port Adapter - 3/8 x 1/2 Female Flare x Male Flare Apter Brass - 108 - UR3-68 | HVACDirect.com
Amazon.com: TEKTON 3/8 Inch Drive (F) x 1/2 Inch (M) Adapter | SHA14102 : Everything Else
1/2" Male to 3/8" Female LP Port Regulator Adapter AA48 - Scuba