An AC manifold gauge is a must-have tool for any service technician who is looking to perform basic pressure check, leak inspection, refrigerant refill or recharge. The Poly Run HFO-1234yf 2-way piston valve manifold gauge set is specially designed for Auto Air Conditioning System with new type refrigerant HFO-1234yf, and used for the commissioning and maintenance of air conditioning and refrigeration systems. The high-quality design with shock-absorbing rubber coating ensures a long service life. Many times the first tool used to help diagnosis A/C problems is a manifold gauge set with hoses. Gauges are used to monitor HVAC/R systems. This model of high-quality manifold gauge set is used to measure pressure of new refrigerant HFO-1234yf. ● Anti-flutter gauges smooth out needle movement ● Easy to read temperature scales on 80mm gauge face (Bar/Psi/℉/℃) ● Easy grip front-facing knobs ● Piston type free-floating valves reduce o-ring wear ● E-Z to re-calibrate gauges to insure accuracy ● Extra large sight glass for visual checks of refrigerant ● Manifold block assembled with (3)12mm- F fittings per SAE J2888 ● Red & Blue Nylon barrier hoses with12mm-M fittings on both sides meets SAE J2888, EPA, SAE or UL standards ● Yellow hose 12mm fitting on one side and 1/2 x 16LH ACME on the other meets SAE J2888 ● R1234yf high and low side couplers with extended disconnect protection sleeve meets SAE J639 & J2888● Item No.: PR-1234yf. ● Designation: Manifold Gauge Set for HFO-1234yf Type Refrigerant. ● Aluminium body with sight glass，80mm gauge. ● 3*1.8M charging hoses — red, blue, yellow with special size connectors. ● One set professional quick coupler. ● Scales in PSI and BAR measurements. ● Temperature in ℉ & ℃ measurements. ● Large sight glass for visual inspections. ● Packed in blow case and color box or sleeve can be OEM, when necessary.