This is the Cressi MC9-SC Compact Pro Regulator for Scuba Diving Features: a Technical features 1st stagea Balanced diaphragm (seal chamber for mc9sc)a 2 outlets hp 7/16 unfa 4 outlets mp 3/8 unfa Service pressure: 300 bar (4350 psi) din version,232 bar (3365 psi) yoke versiona Calibration pressure: 10 bara Brass body electroless nickel plateda High capacity conical fi lter electroless nickel plateda Aisi 316 removable nozzlea Hyper-balancinga Anti-pressure drop pneumatic springa Setting spring: stainless steel with micropeening treatmenta Replaceable cylinder with anti-friction and anti-corrosion propertiesa Elastomer protectora Flow rate: 4500 l/mina Yoke version weight: 650 gra Din version weight: 510 gra Technical features 2nd stagea Improved reliability front cover (more impact resistant)a Downstream systema Adjustable venturi effecta Patented antifriction levera Thermoconductive technopolymer bodya Big purge buttona Anti-scratch surfacea Bayonet-type cap holder with security locka Removable exhaust teea Weight without hose: 140 gra Combination performancea Average cracking effort 7.5 mbara Average breathing effort 1 j/la Jacketed hose extremely light and flexible weight: 153 gra Certification en250/2014 for cold water In order to achieve extremely high performance in low temperature environments, the second stage in particular was designed with the special thermoconductive thermoplastic neopolymer that has the capacity to transfer heat like a metal while preserving the design flexibility, chemical resistance, and physical and mechanical properties of a conventional thermoplastic. That is, it makes it possible to drastically reduce the weight while delivering heat conductivity on a par with metal cases. Thanks to this material and a specially conceived purge valve, it passes en 250 cold water tests CERTIFICATION EN250/2014 FOR COLD WATERTHE MC9-SEAL CHAMBER 1ST STAGE IS ENVIRONMENTALLY SEALED PROTECTING IT AGAINST ICING IN COLD WATER AND AGAINST CONTAMINATION FROM PARTICULATE MATTER IN SILTY CONDITIONS.