[Prevent Leakage] Because the three-color hose connector of R134A manifold gauge set is made of nylon, which is high wear resistance, to avoid leakage of R134A, R12 refrigerant, avoid environmental and health problems, and protect your car A/C equipment when using.

[Sight Glass Design] R134A manifold pressure gauge is suitable for your car A/C system. And sight glass design will help you see the flowing liquid refrigerant, when charging the refrigerant. Low-pressure gauge: -30 to 240 psi, high-pressure gauge: 0 to 500 psi, it will help you get accurate readings in a short time.

[Durable 3-color Hose] The hose is made of rubber material, which is very flexible and durable, and it is not easy to be damaged, and extend the service life of the gauge set. Before use, please connect the blue hose to the low-pressure connector, the red hose to the high-pressure connector, and the yellow hose to the charge/release connector.

[Detailed Instructions] The detailed instructions introduce how to vacuum, recharge the refrigerant. Even if you are not a professional auto repairman, you can also independently diagnose, repair your car A/C, just follow the instructions. Hard plastic plate instructions can be hung, waterproof and durable manual for long-term use.