The 80 is numbered drill sizes, about 0.020 diameter

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Posted by NickD ( on March 05, 2000 at 23:07:06:

In Reply to: Non rebreather O2 mask question posted by Dennis O'C on March 05, 2000 at 19:18:41:

you should have a check valve on top of the bag, that could be sticking, hold it closed with your fingers, this is accessible on the inside of the mask, the mask has holes on both sides where a thin piece of latex rubber mounts as another check valve, normally only one side has this valve so you are drawing in some external air, this is a good safeguard. The bag should fill with air as soon as you turn it on, a mask only last me about six weeks, the elastic band breaks off, or those dinky little plastic tabs that holds the band, I always wash out a new mask, they feel greasy, sometimes wonder about medical supplies, thought they had high standards.

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