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Because lp72s are a 2200 psi tank and plus rated at 2420.... Being 50 years old with some of the thinnest walls ever is another reason to not go crazy overfilling them. They are hydroed at 3600

Sometimes you pretty much have to if the jump isn't perpendicular to the main line. Or if there's no mainline arrow to hold the jump line in place.

Also there can be fast tissues and slow tissues within the same organ. Parts of the kidney, brain, liver, speen etc may on or off gas faster or slower than other parts. "Slow" is an abstract category not a biological unit

Like I said, 120 degrees is a video light. Those go on the arms of your light tray. If you really want to illuminate a cave for your videographer buddy, then get a hand mount for a video light. You seem to want one light to rule them all - in the process it will do nearly nothing great.

Well IANTD's "elite CCR" course doesn't have anything to do with dual CCRs. If there is another one it's not on their website Home

There are zero classes, absolutely no instructors, nor any insurance agencies touching dual rebreather use whatsoever.

The 90deg head will almost for sure have a longer cord. The shorter cord of the backmount lid will be more of a problem than the angle of that cord. It's great to be able to turn down the power (when it's not needed) and really stretch out the burntime 120degrees? That is like a video light...

You won't have a ship MMSI if you show up at an international liveaboard. In theory you could ask the LOB for their MMSI but you'd have to reprogram it at the beginning of every trip and remove it afterwards - which seems rife with opportunity for mistakes.

These are meant to fill tiny little 0.5L air gun bottles. There's a 25 minute duty cycle so roughly 500 minutes (25 on-25 off) to fill an al80. There is also zero filtration - it's not breathing grade air.

An air amplifier and separator parts. You ain't going to be pumping scuba gas with either of them

As mentioned, the OPV on the 1st stage is there for a reason. The schraeder valve won't leak. If your power inflator is on the diluent that will be the point of leakage if the OPV doesn't bubble first.

It's not a streamlining thing. Because the position of the CL mandates that you keep it close to the hydrostatic depth of your lungs. Some units force you to "wheelie" torso up - so the CL is then at the same depth as your lungs. In flat trim it will be above your lungs and easy to exhale, but...

Then buy one ya cheapsake. Typically the price of a replacement bladder is close to the price of a whole new BCD. So unless the new-to-you-used BCD is basically free, it's not going to be cost effective.

Swimming up 15lbs is ridiculously easy. Try it before you claim it's hard or dangerous

Please, for the love of God, place individual markers. "Team" markers are a disaster waiting to happen.

This sounds like rationalizing team line markers because you're using REMs. There have been numerous fatalities when multiple people share cookies or arrows at navigation points like jumps as well as at the infamous snap & gap in Cenote Kalimba. It's a really bad idea.

Having the line tied into the REM just makes it an arrow - although I don't know anyone doing this. Same, I was taught cookies pre-REM. I have noticed that people taught with REMs can sometimes struggle with switching to cookie marking. Especially once the jump is pulled, if it was an...

Cookies are generally fine in 95% of diving When you have super confusing sections of a cave with multiple jumps on a short section of mainline, or a T which is really a hub with spokes, and all kinds of other confusing line management. Or lots of reversing arrows going in-out-in-out. Or lines...

If you stick to original exploration this problem solves itself :cupid:

a) 2 stiches with an awl b) a loop of 1/8" bungie around both bits of web