https://www.acehardware.com/departments/tools/air-compressors-and-tools/air-hose-fittings/1794742
Tru-Flate Brass Bushing 1/4 in. 3/8 in. 1 pc Mfr# TRFL21535 - Ace Hardware
Air line fitting with all brass, corrosion resistant material. 1/4 in. FNPT x 3/8 in. MNPT female bushing.Find the BUSHING 1/4F X 3/8M at Ace.