XS Scuba Pro Convertible valves feature XS Scuba's Safety Handwheel ... so you don't have to guess if air is on or off! Pro Convertible valves feature standard 3/4"-14 inlet threads and a removable yoke outlet insert for conversion to a 230 Bar DIN valve. For steel and aluminum cylinders to 3442 psi working pressure. Dip tube included (not shown). For use with up to 40% oxygen mix.