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Diaphragm actuated, swivel turret, balanced 1st stage. Shares the same high performance of the DST version but with the economy of being unsealed, for use in warmer waters. 4 medium pressure ports (1x 1/2", 3x 3/8") and two high pressure 7/16" ports. Can be converted to DST if required at a later date. Available as a nitrox version (i.e.suitable for use with mixtures over 40%) Pictured with DIN to A-clamp adaptor but not included.