Using this product is easy. First, make sure the surfaces of the pipes are clean. Then, connect the 5/8 end of the reducing union to the appropriate pipe and secure it with the 5/8 flare nut. Do the same for the 3/8 end. This product suits all refrigerant gases, but always double - check the gas type in your system. When it comes to maintenance, check the connections regularly for any signs of leakage. If you notice any, tighten the flare nuts gently. Also, keep the brass parts clean to prevent corrosion. If you have any issues, our team with 25 years of experience is here to help.