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Those that wish to dive this configuration may choose either the no flow oxygen valve or the no flow diluent
valve. The diluent valve, while it is oxygen clean, has a high flow and therefore should not be used in an oxy-
gen environment. These valves are plugged; they do not have an orifice. The gas enters the loop when the
button is pushed. The diluent valve has a higher flow so that loop flushes may be conducted using this valve.
Of course, diluent flushes can still be done using the mouthpiece/ADV as with the Classic KISS.
The oxygen valve can also be used, but divers should remember that when the button is pressed, the gas en-
ters the loop much slower. This means that it shouldn’t be used for a diluent flush as it will take too long. If
this valve is used, do the diluent flush using the Classic KISS method of mouthpiece and ADV.
