EASILY CONVERT any R134a manifold gauge set to a R1234yf manifold gauge set DELUXE R1234yf HIGH AND LOW SIDE COUPLERS meet SAEJ639 and J2888 and allow recovery of entire refrigerant, including the space between the coupler & fitting MALE X FEMALE ADAPTER is 1/2” ACME-M x 1/2” ACME-F LH thread (2) MALE X FEMALE ADAPTERS are 12mm-M x 14mm-F R1234yf Fit type: Universal Fit