nereas
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You must have a dud. I've breathed off both the MTV-100 and the standard DAN demand valve and they both breathe easier than any scuba regulator I've used...
The downside to using a "standard" scuba 2nd stage is that it needs to be O2-friendly and O2-clean. Very few manufacturers are making these, I'm told, and in order for it to TRULY be O2-clean you have to ship it back to the manufacturer for its repair/maintenance in the clean room.
I tried to get DAN to fix or replace it but I got no cooperation from them. So I gave up.
I will stick to my ScubaPro Mk 20 / S600 regulator and my 100% O2 deco bottle instead, for oxygen, like CornFed said, exactly.