XS Scuba Xtr Extra Air SystemMini Tech Gauge (HL502)0 to 5000 psi, wide 210 degree sweepChromed brass case w/ rubber bootCompact First Stage (HL406)Highland DIN direct inletSimple flow-by piston designXS Scuba PRO Valve (VX200-30N-VI)Combination DIN/Yoke outletDIN insert includedDIN Cap (HL401)Seal water out of your first stageMachined Delrin mater..