Eastman Lead Free 1/2" Male NPT MPT MIP Close Nipple Brass Pipe Fitting Fuel / Air / Water / Boat / Gas / Oil WOG (1/2" x 2.5" brass nipple) - Walmart.com
JMF Lead Free MIP Brass Push-to-fit Male Adapter Fitting - LF2310108089802 | Blain's Farm & Fleet
Proline Series 5/8-in x 1/2-in Compression x Mip Adapter Coupling Fitting in the Brass Fittings department at Lowes.com
LTWFITTING 1/4 in. O.D. Comp x 1/2 in. MIP Brass Compression Adapter Fitting (5-Pack) HF684805 - The Home Depot
National Brand Alternative 120-6-4 3/8 in. MIP x 1/4 in. FIP Brass Connector