The DSV has been completely redesigned from the ground up for exceptionally low work of breathing in the most compact design possible. Two high-performance mushroom valves are used to ensure proper one-way gas travel.
The lever on the front of the DSV is used to open the DSV for diving and close it on the surface or during a bailout procedure to prevent water from entering the loop. The DSV utilizes a friction seal between the outer body and the inner barrel, so there are no O-rings to wear out or replace on the barrel.
The DSV uses a bayonet-style quick-lock system to attach the hoses. To remove, simply press in the spring-loaded white locking button and turn the connector ring 1/8 turn counterclockwise. The hose can then be pulled free. This feature allows fast and easy inspection of the mushroom valves and easy cleaning and maintenance.