Easy to recalibrate anti-flutter R1234yf gauges smooth out needle movement Manifold block assembled with (3) 12mm (F) fittings per SAE J2888 60 red and blue nylon barrier hoses with 12 mm (M) fittings on both sides meets SAE j2888, EPA, SAE and UL standards 60 yellow hose with 12mm fitting on one side and 1/2 – 16 LH ACME on the other meets SAE J2888 R1234yf standard couplers