SPG or not

[Belzelbub]

Still a good idea. Most dive charters are going to check your valve before you splash. If you cut the valve back a quarter turn the person who turns it knows it's definitely on when it twists open that last little bit. If it's all the way open they really gotta give it a twist to make sure it's not firmly closed. Makes their job easier and repetitive attempts to twist an already valve open even more isn't going to do it any good.

Doesn’t sound like a good idea to me. I prefer it to be fully on or fully off. No chance in making a mistake then. If it’s somewhere in between, it could be mostly on or mostly off. If it’s mostly off, it will turn either direction when the crew checks. Breathes fine until higher flow needed at depth.

 

[LI-er]

Doesn’t sound like a good idea to me. I prefer it to be fully on or fully off. No chance in making a mistake then. If it’s somewhere in between, it could be mostly on or mostly off. If it’s mostly off, it will turn either direction when the crew checks. Breathes fine until higher flow needed at depth.

I didn't say it should be turned mostly off. A quarter turn off won't make any difference unless perhaps if the diver has severe COPD.