Mastercool (83272) R1234yf Aluminum Manifold Gauge Set MANIFOLD BLOCK assembled with three 12mm-F fiittings per SAE J2888 72 INCH RED AND BLUE NYLON BARRIER HOSES with 12mm-M fittings on both sides meets SAE J2888, EPA, SAE and UL standards 72 INCH YELLOW HOSE with 12mm fitting on one side and 1/2 x 16 LH acme on the other meets SAE J2888 R1234yf HIGH AND LOW SIDE COUPLERS with extended disconnect sleeve meets SAE J639 and J2888 EASY TO READ temperature scales on 3 1/2" gauge face (Bar/PSI/F/C) PISTON TYPE FREE FLOATING VALVES reduce o-ring wear