ACME AC R134a Brass Adapter Freon Fitting 1/4" Male to 1/2" Female w/ valve core ACME AC R134a Brass Adapter Fitting 1/4 Male To 1/2" Female" W/ Valve Core SKU# ACME-X FREE SHIPPING FOR ALL USA AND TERRITORIES. Brass R134A Refrigerant Tank Adapter. 1/2 Inch Acme Female X 1/4 Inch Male Flare W/ Core. Connects R12 Hose To R134A Refrigerant Tank. overall Dimension 3/4 Length 1.5""