Cyl-Tec 80CF Scuba Diving Tank - (3000 psi) Aluminum Diving Cylinder with Combo Valve This tank ships ready to fill (empty) and is DOT/TC certified. Federal law requires the tank be shipped unfilled. Cyl-Tec's 3000 psi Scuba Diving Tank has an Air Capacity of 80 CF. Working Pressure = 3000 psi (207 bar) Salt Water Buoyancy (Full) = -1.9 lbs; Salt Water Buoyancy (Empty) = 3.8 lbs This tank is perfect for both beginner and experienced divers! This tank is intended for use in scuba diving includes a new Combo Valve (accepts both DIN and K-type connections). Cylinder height with valve = 29.75"