Certified A/C Pro R-1234yf Gauge and Hose Professional Grade dispenser features an extra-large gauge, easy-to-use trigger dispenser, 24 inch 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 increases in pressure during the recharge process. This product is compatible with both sealed and self-sealing R-1234yf cans.