Faber FX Series 100 cu ft High Pressure Blue Steel Tank F-X Din/Yoke 3442 psi, Steel Scuba Tank, Steel Scuba Cylinder, Diving Tank, Scuba Cylinder, Scuba Tank The 100cf Faber Blue Steel FX Tank is an excellent high pressure steel tank. F-x Series is a DOT E-13488 specification, no overfilling is allowed. All F-X Series cylinders are oxygen cleaned and suitable for Nitrox use Inlet Thread 3/4" - 14 NPSM. Specifications: Height 25.39"(w/o valve), Diameter 7.24", Weight 34.3lbs (w/o valve)