H. O2 Injection block and Inlet with female QC6

MX Rebreather - O2 Injection block and Inlet with female QC6

The O2 Injection block is stowed on the left side, closest to the offboard O2 bottle  and requires the diver to press the button to add O2 to the loop. The O2 injection block is stored in such a manner that it can be reached with either hand to ensure O2 can be added at all times, even if one hand is occupied.

Small amounts of O2 can easily be controlled and added to the loop. The inlet to the O2 Injection block is a wet pluggable female QC6. The advantage of this fitting is that if nothing is plugged in it will not allow water to penetrate the block. The QC male nipple is connected to a 22”/56cm LP hose on the offboard O2 bottle and is plugged into the female QC, supplying the O2. It can be quickly and easily detached if the O2 block was to fail open, adding unwanted O2 to the loop. It can also be interchanged underwater with another O2 supply bottle or another deco bottle to supply gas if the primary O2 supply was to fail. Spare male QC nipples are carried either in your pocket extra staged bottles depending on circumstances.

A side note: The diluent injection block also has the same female QC fitting on it, so if the O2 injection block was to fail closed, not allowing gas to be added to the loop, then one could plug the O2 or another gas into the diluent block, of course ensuring you isolate the diluent feed from the diluent/bailout tanks (see section “P”).