The balanced piston ensures a minimum cracking pressure and a minimum pressure drop across the entire breathing cycle.
It has four standard low pressure outlets plus one "straight through" high flow port designed to be used with an optional big bore low pressure hose. Two high pressure ports are standard as well.
DSI 200-017 Overpressure Relief Valve
DSI 225-017 Overpressure Relief Valve Rebuild Kit
DSI 325-105 Superflow First Stage Regulator Rebuild Kit
DSI 325-321 1st Stage Rebuild Kit, Standard