First Stage: made from Sand-blasted forged brass. High-performance balanced diaphragm design: The Intermediate Pressure is always constant during the dive at any depth. Simple and fast maintenance. HP ports: 2 LP ports: 4 Replaceable stainless-steel Valve Seat: designed to offer great safety, it can be easily disassembled to make maintenance easy. Second Stage: made of technopolimers, elastomers, and metal components. Front cover enhanced with rust-proofing and scratch-resistant Luxury Technology treatment. Adjustable breathing effort and Venturi effect. OWS System: the Cover is designed to prevent free flow even in strong currents.