This is the XS Scuba 2.75 High Pressure Gauge Module Replacement Features: Dual read gauge 0 to 5000 psi and 0 to 350 bar 2.75" diameter 1/4" male NPT thread Accuracy 1.5% throughout entire scale Shock resistant housing Replacement gauge for AC360, AC365 & AC366 Gauge boot not included (p/n GP17) Above water use only