1/2 "ntp Firg 12 A Npt - Thread 1/2 Mm Characteristics - Interchangeability: Iso 16028 (from Size 6. 3 To 25) Htma (size 10) - Sealing System: Flat Face - Coupling: Pushing A Part Towards The Other - Decoupling: Moving Back The Ring Nut Of The Female Coupling - Connection With Pressure: Not Allowed - Disconnection With Pressure: Not Allowed - Threads Available: Bsp, Npt, Sae - Construction Material: Carbon Steel. - Surface Treatment: Galvanizing Crystals - External Springs: Aisi 302 - Internal Springs: Steel C72 - Balls: Hard Steel 100 C6 - Seals: Standard In Nbr (nitrile)