2020 UPGRATE VERSION: 1) Can tap with back-flow preventer. 2) 100% brass and aluminum valve gauge body, knobs are made of brass instead of plastic. Tester Freon gas Service Diagnostic AC Gauges; A/C Manifold Gauge Set; Aluminum housing; R134A R410A R404A R22 Manifold Gauge Set A/C. Blue Gauge (low): 0-550 PSI ; Red Gauge (high): 0-800 PSI ; Burst pressure: 4000PSI ; Max working pressure: 800PSI ; Fahrenheit degree unit with easy to read instrument panel. red for high pressure, blue for low pressure, yellow for refrigerant bottle with ACEM 1/4"; black for vacuum pump with ACEM 5/16" 1x 4-way gauge (1/4" male); 4x hoses (1/4" female); 2x adjustable couplers (1/4" male); 1x adjustable can tap (piercing-style)(1/4" male); 1pc valve core wrench; 3x ACME & tank adapter; 1x case; 1x manual Test your automotive air conditioning systems with this brand new Manifold Gauge Set. This set includes high pressure and low pressure dual color-coded gauges, large and clear dials, quick-disconnect valves and three 60" charging hoses.