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There seem to be people who disagree with me about this, but my answer is yes/no. Yes to the important parts -- a demand valve attached to a DISS fitting will bypass the lpm settings on your regulator, and most importantly, yes, you will get as much O2 as you need every time you need it just by inhaling. This second part is not relevant to the "yesses" I just stated, but it's of interest to me, and I will be happy to be corrected if I am wrong. I think lpm stops being meaningful when you are using a demand valve. Think of the typical mask with a reservoir bag. The lpm determines how fast the bag gets filled, but when you breathe in, you are not breathing the O2 in at the rate it came into the bag (the lpm that your regulator is set to), you're breathing it in at whatever rate your inhalation creates. With a demand valve, the O2 is always available, so there's no bag to fill, and therefore no relevance to flow rate in that regard. Similarly, as with a bag-based mask, when you breathe in, you are breathing in at whatever "flow rate" your inhalation creates. Doesn't matter what it is; the oxygen will always be there for you.

CH Hi! I do remember you from back in the day lol. I was Hedferst then. I actually did a maintenance dose every year for years...funny after 4 years PF I assumed they were gone...remember reading early on that eventually they peter out...at least back in the 90's that was the idea. So I assumed at 50 I was done with them (started at 19). I do know for sure the further south in the US I lived the (hate to even use this word with clusters) milder they were. Of course, after getting careless with preventative dosing...the bastard came back. Its been few weeks now and I am smacking it back..I can feel it loosing its fight...but it came back. One thing for certain...prior to MM, cluster was who I was...AFTER MM? Cluster is something i have...it no longer owns me. And while having them now is no laughing matter, knowing I have beat this so many many times over the past 20 years, I look at as a painful inconvenience....that will pass in a couple of weeks..unlike the 3 month cycles I endured for the first 20 years...In fact, it smacked back hard after the first dose, but has progressively decreased in severity and frequency over the past 2 weeks and if I don't so anything stupid like drink wine or a scotch (my tequila idea of being clear didn't work lol) I am getting by with a trusty ice pack to the neck and temple...energy shots and Bendryl...not bad...not too bad at all. Nice to see you are still here. Sad to see Andrew and Mark gone. I'll never be able to repay the debt.

Me, too. The Sewell poster on LSA. As you say, Geoff', may that wonderful man rest in peace. He answered every email question I sent him with kindness and compassion. Geoff' -- Did you do maintenance dosing to prevent cycles?