Apeks ATX single tank tech set

The DS4 First stage: 

• The performance of the DS4 first stage is the same as the TX-40 and 50 first stage (DST first stage )but has no swivel turret for the LP ports
• 4 medium pressure ports, 4 x 3/8" UNF
• 1 high pressure ports, 1 x 7/16" UNF

The ATX40 2nd stage and AT20:

• Smaller and 25% lighter than its TX predecessor. This results in less jaw fatigue and less drag.
• This pneumatically balanced is ideally suited for an over-balanced Apeks first stage.
• The diver has full control of the venturi by means of a lever so as to prevent accidental freeflow when the octopus is not being used.
• The excellent cold water performance of the ATX40 is due to the highly efficient heat exchanger on the second stage. The AT20 also works in mid cold water