it is a groove in the sealing face. nothing sticks out at all. if it was to stick out you would have a hell of a time getting it to seal properly which is what I suspect is happening with Brads. the groove creates an increase in the amount of surface to surface contact which increases the sealing ability. the face of the actual valve on the bottle has several grooves to increase the sealing surface against the teflon. Tomorrow I can take a pic at a different angle if it still isn't clear.
Brad, to me it looks like yours has a insert threaded into it, but it still protrudes a bit. am I seeing this right? to me it looks like someone took a brass plug that uses a allan key to tighten it and drilled it out.
if so, what some one could have done is taken some other type of regulator and "adapted" it in a mickey mouse fassion to work on CO2. if it is a threaded plug this might not be to safe over time as when you combine different metals you set up a corosion process which in time could eat away at one of the metals and allow the pressure to blow the end off the regulator. I would have some serious resavations about using that regulator untill you find out exactly what is going on. if you need one right away you could borrow mine for a week or two as that is how long it is going to be befor I will be set up again.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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