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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" flair hose ends. we have can tapper for all types of manifolds. out model Tap1 with 1/4" flair connector, Tap3 with 1/2" ACME. make sure you pick up the right one.FEATURES