Dan, 15 ipap 8.0 epap I also use the same mask as you do the OptLite I have gone though a number of types of mask since 1998 I do like the way this mask works. I was on a cpap till this last sleepstudy in Dec 2008 when they put me on a bipap due to now having CSA along with OSA. I had the surgery in 1998 (which I do not recommend, did not help much and lots of issues with eating now -- swallowing problems at times) and then went on a cpap right after it. I am still trying to find a way to get a copy of my last sleep study results.