Welcome to ScubaBoard, an online scuba diving forum community where you can join over 205,000 divers from around the world discussing all things related to Scuba Diving. To gain full access to ScubaBoard (and make this large box go away) you must register for a free account. As a registered member you will be able to:
Participate in over 500 dive topic forums and browse from over 5,500,000 posts.
Communicate privately with other divers from around the world.
Post your own photos or view from well over 100,000 user submitted images.
Gain access to our free classifieds marketplace to buy, sell and trade gear, travel and services.
Use the calendar to organize your events and enroll in other members' events.
All this and much more is available to you absolutely free when you register for an account, so sign up today!
If you have any problems with the registration process or your account login, please contact the ScubaBoard Support Team.
Most in mask purge valves use a one way mushroom valve. It allows air or water to move out the valve, but the "wagon wheel" under the valve prevents the valve from letting anything back in.
Small purge valves are pretty ineffective as it takes a long time to vent much water through them so you want one about 3/4" in diameter.
In-mask purge valve are nice with poorly fitting masks as if well designed the water will pool in the purge valve in a normal swimming position and an occassional exhalation through your nose will expel it. In a good fitting mask, they are redundant and serve no useful purpose in my opinion.
The sniff test works pretty well if you do it with a mouthpiece in your mouth. Obviously, whether or not you have a mouthpiece in your mouth changes the contour of your upper lip.
Thanks for your reply, if the purge is ineffective can the ordinary tilt head back etc technique still be used? sorry if this seems like a stupid question but I have never seen a purge valve before. Thanks again and best wishes,
This seems to be the only mask that fits my face,and i have tried many.i think its brill.have u ever tried to use a snorkel without a purge valve on it,they work terrible.and i think the same about a mask without a purge valve.if water even trickles in,all u do is exhale through ur nose without ever using ur hands to lift mask to clear.i would highly recommend this mask(if it fits ur face)to anyone.also the one peice lense is also very good.
Although I've never used a purge mask, I know lots of people who do and they all love them. The only time I've heard of people having problems with purge valves is when they are in a low-volume, dual lens mask with the valve under the nose.
IST's masks are great and cost much less than name brand masks (which might be made right next to IST's). Be sure to try the mask on with a mouth piece, as well as move your jaw and lips around to see if the sniff test seal sticks.
I have been using these masks for almost 15 years & have never had an issue once you get use to being able to equalize, they are a hi volume mask so they are further from your eyes than any other mask but I have been to 65mtrs a number of times & no problem. You want to know more email me welshdiver@hotmail.com.
LinkBack URL
About LinkBacks
Reply With Quote
