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You got that right.I never really understood the reason dor a purge valve. Forgive my ignorance, but it seems to me the shirt of the mask is a purge valve.
Definitely buying at a dive shop to test for fit (comfort too). Absolutely. Yesterday I stepped into a shop I was just driving past, went in tried on the first mask I saw witrhout donning the strap, sucked air in through my nose & it stuck to my face so well I could walk around the shop for half hour without it coming off (as long I didn't exhale through my nose). I asked the clerk how much. He quoted $70 & told me that was about average for what I was looking for. I thanked him & told hime I'd be back. Any comments?
I never really understood the reason dor a purge valve. Forgive my ignorance, but it seems to me the shirt of the mask is a purge valve.
I recently bought a very fine, well fitting backup mask for $15. I shop tent sales and closeouts at dive shops for things I may need in the future. If you pay over $30, you're in too much of a hurry. Of course, you might be in a hurry because your class starts tomorrow or you broke/lost your last mask.