| The St John reg has a few problems with it (and I know coz I've got one)
It doesn't have a demand mask and valve with it which is def the method of choice for a conscious, breathing bent diver with no other complications. It uses the least oxygen and delivers the highest concentration of O2
It does enable you to peform positive pressure resuc on someone with a bag (BVM) which as Helen points out is a good method of resucing someone - but really needs two people and is fiddlier than using the "push button" MTV style combined positive pressure resuc + demand valve
It only has a maximum flow rate of 15l/min on the constant flow rebreather mask setting. A heavy or panicked breather will need more than this until you've stabilised them and lowered their breathing rate.
Trust me the DAN kit with an MTV100 demand valve in it is the way forward - this will give you:
Demand Valve + MTV Positive Pressure Resuc in one compact unit
Non rebreather mask <25l/min
BVM Bag Resuc (£20 extra - add it yourself)
I have a 5l steel cylinder in my kit which gives you a load more O2 than standard small ali O2 cylinders. The SAP converter attaches the 2 pin reg onto the DIN fitting on the cylinder. This can then be switched off the "onboard" O2 cylinder onto a an O2 / Rich Deco bottle in the event of a prolonged wait for EMS.
The DAN kit is about £610 excluding a cylinder - available from DAN Europe UK up in Leics - not cheap - but def the best option |