Ist StageMODEL NO: AS-102-DIN-ICEBALANCED DIAPHRAGMBalanced diaphragm design delivers superiorbreathing performance even at increased depths.Made with corrosion resistant marine brass,chrome plated finish.Superior and reliable performance to meet withtechnical diver rquirement as well as the demandingneeds of the Cold Water diver.Ventilation rate ( air supply / 3000 psi ) : 135 SCFM.Intermediate pressure: 135-145 psi. ( 9.5-10.2 barHigh pressure port: ( 7/16"-20 UNF ) x 2Low pressure port: ( 3/8"-24 UNF ) x 4 plus swiveling turretDIN.Weight:800g