30Pcs Access Service Valve, 1/4'' SAE x 1/4'' OD x 3.54'' Stem Core Brass Copper Filling Access Valves, Air Conditioner Service Valve Charge Needle Valve Specification: Service/ Access Valves Material: Copper and Brass Color: Gold Thread: 1/4'' SAE x 1/4'' OD Length: 4.72'' total length, 3.54’’ stem Tube Thickness: 0.025’’ Features: Strong and durable, as a bleeding and test port on the fuel rail of some fuel injected engines. On many refrigeration and air conditioning systems to allow servicing,including recharging with refrigerant. The stem is a self-contained valve which opens to admit gas to a chamber. 30pcs service access valves included in a package.