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MAV (Manual Addition Valve) Oxygen in solid Delrin.
Valve and valve knob made of chrome plated brass.
Body is marked as "Diluent" or "Oxygen".
Haptically coded knob to be sure which knob you touch in case of zero visibility.
Body with 2 inlets and 1 outlet, threads are 9/16" female.
Adapters can be added: