The Super Tech R-1234YF Refrigerant Charging Hose with Gauge features a dial gauge rubber hose can tap on one end and 90? coupler on the other end. The dial gauge is easy to read with color ranges to gauge the pressure accurately. The 15 AC charging hose gives extra length to access hard-to-reach ports easily. The gauge can identify the current low-side pressure in the system and determine if increases in pressure during the recharge process. Compatible with self-sealing R-1234YF refrigerant cans this reusable portable hose attaches easily for quick recharges. Simply push the quick coupler onto the low-side port to dispense refrigerant. This product is designed to work only with R-1234YF cans with self-sealing valve can tops and fits for car AC refrigerant charging.