Certified A/C Pro R-1234yf Gauge and Hose Professional Grade dispenser features an extra-large gauge, easy-to-use trigger dispenser, 24" hose, and a quick-connect R-1234yf coupler. The gauge is able to diagnose if a recharge is needed, identify the current low-side pressure in the system, and determine when the recharge is complete. This product is compatible with both sealed and self-sealing R-1234yf cans. One AC Pro Auto AC Recharge Gauge and Hose Dispenser, R1234yf Extra large easytoread gauge for accurate charging 24 AC charging hose is long enough to reach difficult ports Pushon quickconnect coupler lets you easily connect the refrigerant hose Trigger dispenser offers easy use for effortless recharging