This user-friendly refrigerator quick coupler adapters are used for connecting 1/4" SAE hose fitting to R134A automobile refrigeration tank. It comes with premium quality, ensuring easy maintenance, durability, as well as resistance to corrosion. Two additional joints can easily connect valve and threads inside, making a great snaps on / off and avoiding the Freon leakage. It is easy to operate, just connect bottoms with R134A service port, connect the ACME adapter with the refrigerant hose and turn on/off the switch at top. Delivery includes blue low side and red high side quick adapters.