The Faber HP100 Steel Cylinder is manufactured using deep-drawn chrome molybdenum steel allowing you to have better buoyancy characteristics with a light weight cylinder. Triple protected finish for long lasting durability with a Zinc Galvanization spray process followed by an epoxy paint and then a polyurethane top coat. The Faber HP100 Steel Cylinder has an exclusive phosphatized-cleaned internal surface. The Faber HP100 Steel Cylinder is has a DOT special permit #13488 and transport Canada #SU7694-237. All Fabers are Oxygen cleaned for use with up to 40% pre-blended Nitrox. The Faber HP100 Steel Cylinder has a working pressure of 3442 psi and a standard inlet thread of 3/4"-14 NPSM. All Faber Steel Cylinders are equipped with a XS Scuba Pro Valve with PVD Finish and safety handwheel.