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MAV - manual add valve typically used for back mounted counterlungs.

CNC manufactured from solid Delrin - body . Valve and valve knob manufactured form chromed brass.
Body marked as "Diluent" or "Oxygen"
Knob haptic coded to be sure which knob you are touching in zero visibility.

Body with 2 inlets and one 1output. All threads are 9/16" Female. you can chose insert for each side.

Available this inserts:
3/8"Female - same thread as on 1st stage LP port
9/16" Male - same as 2nd stage, you can connect standard regulator hose
Quick connect pin - you can connect standard jacket quick connect hose