The Seac D ICE DIN 300 bar 1st Stage is made of sand-blasted forged brass and features a high-performance balanced diaphragm design to maintain constant Intermediate Pressure at any depth. The ICE Kit fully isolates moving parts from water contact for excellent thermal protection in cold water. With 2 HP ports and 4 LP ports, this 1st stage also includes a replaceable stainless-steel Valve Seat for easy maintenance and enhanced safety.