This easy-to-use XS Scuba Standard Fill Checker is designed for K valves only. It has a large 2.75" (7cm) diameter, stainless steel case gauge which provides dual scale psi and bar. The large, stainless steel bleed screw is replaceable. Take the easy way to check the pressure in your yoke style tank! Tired of mounting your complete regulator on your cylinder to check tank pressure? The pressure gauge includes 5,000 psi (350 bars) range readout, chrome plated marine grade brass high pressure yoke fitting and bleed-off valve for easy detachment. Gauge is equipped with impact resistant rubber boot for added protection and a large plastic yoke screw. Boot includes hole in top for over-pressure plug, Twist bleed-off valve has a positive seal PDVF seat.