●Thread size: 1/8 Inch NPT external thread; Length: 31mm, thread diameter: 9mm ●All brass structure, anti-corrosion and not easy to rust, durable and sturdy. ●Use with 1/8 Inch NPT external thread filling valve and air compressor tank. A 1/8 inch NPT tank valve can prevent air leakage during air expansion. ●The working pressure is 200PSI, and the maximum working pressure is 300PSI. ●Compact size, good sealing, safe and reliable use, high thread accuracy, firm fastening, and no slipping.