Ocean Reef 1st Stage SL 35 TX DIN 300 Bar  For Neptune Space Full Face Masks   Ocean Reef 09923   The SL 35 TX is a high performance, balanced diaphragm 1st stage with anti-freeze kit designed for the Neptune Space. The first stage has adjustable medium pressure and is made of brass with a plated chromed finish body, stainless steel piston, Teflon seat, and stainless steel spring.   High performance balanced diaphragm 1st stage Adjustable medium pressure Made of brass with a satin body finish DIN connection 300 bar 2 high pressure ports 7/16-20 UNF 4 medium pressure ports 3/8-24 UNF Flow rate of approx. 4800 l/m at 140 bars