Faber FX Series 120 cu ft High Pressure Blue Steel Tank F-X Din/Yoke 3442 psi The 120cf 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. nlet Thread 3/4" - 14 NPSM. Specifications: Height 29.33"(w/o valve), Diameter 7.24", Weight 39.2lbs (w/o valve)