Product Description STEEL CYLINDERS HIGH PRESSURE 3442 PSI DEEP DRAW MANUFACTURING FEATURES: Hot Dip galvanized exterior finish Chromium Molybdenum steel alloy XS Scuba PRO valve with Safety Handwheel Self draining tank boot - except LP27 Inlet thread is standard 3/4-14 NPSM Ideal buoyancy characteristics Factory cleaned for up to 100% oxygen Negatively buoyant throughout the dive Approved for use in both the US (DOT) and Canada (TC)