Car AC, R134a Can Tapper Charging Tool with 1/2 inch ACME Male Connector to R134a manifold gauge/hose, model Tap3 not all manifold marked with R134a are the same. only those strictly made for car AC come with 1/2" ACME on the yellow hose end. home AC R22 manifold may mark R134a refrigerant on the gauge as well. the later manifold will come with 1/4" flare hose ends. we have can tappers for all types of manifolds. out model Tap1 with 1/4" flare connector, Tap3 with 1/2" ACME. make sure you pick up the right one. FEATURES R134a can tapper, one piece. 1/2" Female ACME to the R134a can(American Standard), with hand operated punch/valve control 1/2" ACME Male connector to manifold set or other tools.(NOTE: 1/4" SAE male Flare connector Tap1 available, for R22 R12 manifold) brass/SS fittings, constructed sold, heavy duty, designed to last. High quality, reusable service tool for decades to come. For car service professionals and the do-it-your-self handymen. Look for SKU Tap1 or even better QT if you have a R22 manifold gauge set and you want to serve on car AC systems. More HVAC Car AC Adapters couplers available from W3.viot.us Please look there.