- exhaled gas goes to the single counterlung
- diluent and O2 are added by diver through MAV to the counterlung
- gas goes through the scrubber, mixing
- CO2 removes in the scrubbercells measure the ppO2 level which is shown on the monitor
- gas goes to the DSV to be inhaled

- perfect WOB in all possible positions of the body
- control the volume of gas inside more efficiently
- no mount of the unit to pass restrictions
- possibility to give the unit to a buddy in an emergency case
- possibility to take off and leave the unit in a cave in case of a total flood in an emergency case

- s7 works perfectly with one tank or a double tank in Backmount
- It is reasonable to keep a 1-2L O2 tank on the body of the unit

- Axial scrubber - the simplest type of scrubbers. No orings – more reliable!
- capacity of the scrubber - 1.9 kg
- time of breathing – up to 4 hours, depending on the condition of diving. In cold water lower 6 degrees, a neoprene sleeve helps to keep the efficiency of the absorbent. s7 is short, and the temperature of the gas drops less than in ”big and long” units!
- difficult speleo logistics? Put 1 kg of absorbent for up to 2 hours of diving to reduce the weight of the CCR

Manual Addition Valve:- supplies diluent and O2 to the looporifice or needle valve is inside- orifice supply 1L O2 per minuteneedle valve has an adjustable tension of the rotation of the valve
O2 MAVmaintains breathable oxygen levelscompensates for metabolic oxygen consumption
Diluent MAVreduces PO₂ if too highmaintains loop volume during descentflushes the loopprovides breathable gas in emergencies

To connect off-board gas, any type of connectors can be used. In basic configuration, S7 goes with inflator connector for Dil and 9/16 male connector for Oxy
For serious diving in case if you need to change gases underwater we recommend to use Swagelock QC4 for Oxygen and QC6 for Diluent:- one type of connector, but with different diameters. The same muscle memory, but no possibility of making a fatal mistake and connecting the wrong gas- big connectors – easy work even with thick gloves- minimum water goes inside when the connection does underwater – minimum risk of water with salt or sediment going inside of MAV to damage it

- no cablesa Halcyon transmitter in the s7 head. No cables, wireless connection to a Halcyon computer and HUD
- one AK4 cableTo connect a Shearwater computer
- one AK4 cable and Halcyon transmitterTo connect a Shearwater computer and a Halcyon computer and HUD at the same time
- 2 AK4 cablesTo connect a Shearwater computer and a Shearwater NERD