r12 r22 r134a r404a manifold gauge set 3" gauge hvac a/c refrigeration charging service senmod compatible with r12 r22 r134a r404a ; durable brass body ; large 3in. gauge is easy to read ; 3 color-coded freon service charging rubber hose : 2500psi burst 500psi max. w.p.; 1/4" fitting on both end ; overall length 36in. ; r134 quick couplers for high/low fittings(red and blue) included ; r134 acme adapter(1/4" sae male to 1/2" acme female) included .