Environmentally dry sealed version of the US4 1st stage with 4 medium pressure ports and one high pressure port. Adjustable intermediate pressure. Finished in highly polished chrome. 1st stage ports: 4 x 3/8 UNF and 1 x 7/16 UNF. A work horse with years of tested and proven experience now preferred by the most demanding technical divers.

 

Pneumatically balanced 2nd stage with venturi control. Heat exchanger - suitable for both warm and cold waters. Front cover contructed from a new two-shot high strength plastic, improving the durability of the most vulnerable part of the demand valve.