BOV/gag strap vs. OC second stage on bungee necklace

[doctormike]

Why run the BO from your on-board dil at all? My on-board dil is far more likely to be hypoxic than my offboard BO. I can and often do use 10/50 dil with 18/45 or 21/35 BO.

The OP (me) is mod 1, so air diluent only, for now.

 

[kensuf]

I have both a shrimp and I keep a second stage on a bungee loop around my neck. The shrimp is driven from the same bailout source as the second stage.

 

[doctormike]

I have both a shrimp and I keep a second stage on a bungee loop around my neck. The shrimp is driven from the same bailout source as the second stage.

Great. Not too bulky? Hoses easy to streamline?

 

[kensuf]

Not too bulky at all. Additionally, if I am unfortunate enough to get a caustic, I have a fresh clean working second stage right under my chin.

As for routing, I spent some time measuring hose lengths to get the hose routing pretty clean. I also drive my DIL from the same off-board source, so there's a QC6 female end connected to a splitter that drives the BOV and the ADV, that splitter and the QC6 are on my left shoulder.

 

[doctormike]

Not too bulky at all. Additionally, if I am unfortunate enough to get a caustic, I have a fresh clean working second stage right under my chin.

As for routing, I spent some time measuring hose lengths to get the hose routing pretty clean. I also drive my DIL from the same off-board source, so there's a QC6 female end connected to a splitter that drives the BOV and the ADV, that splitter and the QC6 are on my left shoulder.

Interesting! So you don't use onboard dil at all? What unit?

 

[kensuf]

I dive a KISS classic but have several friends that do the same with their Meg's, JJ's, SF2's and other rigs. Remember, our focus is cave diving -- I've done dives where a 3L bottle wasn't enough for just wing and drysuit inflation due to depth changes and bottom times, let alone dil.

If I was doing simple non-penetration diving, I'd go ahead and use on-board dil. My BOV would still be connected to the bailout though.

 

[doctormike]

I dive a KISS classic but have several friends that do the same with their Meg's, JJ's, SF2's and other rigs. Remember, our focus is cave diving -- I've done dives where a 3L bottle wasn't enough for just wing and drysuit inflation due to depth changes and bottom times, let alone dil.

If I was doing simple non-penetration diving, I'd go ahead and use on-board dil. My BOV would still be connected to the bailout though.

Got it. I use off board bailout (AL80) for the dry suit, but onboard for the wing. I guess I could also use larger onboard bottles - the JJ is pretty flexible with that, my instructor showed me how it worked with AL40s at one point.

 

[rjack321]

The OP (me) is mod 1, so air diluent only, for now.

I meant that @Tassi Devil Diver 's dual source system doesn't accomplish much and makes it more likely to have hypoxic gas feeding the BOV.
But in your case I have the same question, so you have air as onboard dil and a cylinder of 30% as offboard bailout. Why put in both with differential IP pressures, splitters, multiple shut-offs and all that complicated stuff? All that accomplishes is making something simple complicated. You might start a dil with a half full 3L cylinder of dil - almost nothing and its air. If you "need" that in a bailout situation you need to be bringing a larger BO cylinder. Diving air dil, an al80 is more than enough to get you to the surface from <40m.

Interesting! So you don't use onboard dil at all? What unit?

If you offboard the dil (for caves as @kensuf said) The onboard (usually left) cylinder makes for a cushy amount of suit gas.

 

[Michael Guerrero]

JohnyC,

For your Pelagian, is your backgas/BO also your dil plumbed to the BOV with off-board O2 on QDs?

 

[The Chairman]

Where's a good place to buy a gag strap? I don't want to get hosed.