I'm violating my own self-imposed "no late night postings" rule here, but this is something with which I've had a recent experience. Since purchasing my drysuit, I have always felt that the exhaust valve did not vent quickly enough, and made a disticnt tinkling noise as it vented. I blamed myself for this - that I wasn't using the suit correctly. How would I know? Tired of listening to this, my s/o recently swapped out valves with me - same manufacturer for the valve, different label for the suit- and low and behold - he finds that "my" valve does vent much slower. Although I like the rate at which "his" valve vents, I no longer hear that unique air venting sound. Makes me wonder what the specifications are...and it's not a happy thought.