O2ptima expedition blocks

[tomfcrist]

Should be a simple question. I have the expedition blocks on my o2ptima. The O2 side is simple enough, and if I need to go to offboard O2 I have to disconnect the O2 hose and swivel it down to plug off board.

The Dil side however is just an empty swivel block. If I hook up off board gas and shutoff the ADV, do I need to unhook the onboard dil hose to ensure I'm on offboard dil?

I tried just hooking it up and doing a dil flush, but the Ppo2 dropped to what I would have expected for the air dil , vice the 32% I had plugged from off board.

 

[tbone1004]

wait what? please post pictures so we can follow the gas flow.

alternatively, considering diving dual O2 on the back and dilout on the side

 

[tomfcrist]

O2 side finger on oxygen feed.

O2 side finger on solenoid feed.

Finger on Dil feed. Offboard swivel on the side.

 

[tbone1004]

there is no switching mechanism inside of that feed so it will pull from whichever reg has the higher IP. You'll want to put a shutoff on the onboard dil inlet