Brass Pipe Fittings, Water Hose Adapter, G 1/2 Female to G 3/8 Male Reducer Adapter, Compression Fitting for Kitchen Bathroom Faucet, Pipe Connector with Rubber Washer,(2 Pack) - - Amazon.com
Aluminum Adapter, 1/2" Male NPT to 1/2" Male NPT | Air & Hydraulic Equipment,Inc.
PRECISION ARMAMENT THREAD ADAPTER 1/2-28 TO 5/8-24 | Brownells
CRAFTSMAN 3/8-in to 1/2-in Standard Socket Adapter in the Socket Adapters department at Lowes.com