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I have serviced a couple of MK2 and MK5's, but this one has a light blue o-ring below the piston that I have not seen on any other MK5's and it did not come in my MK5 service kit (I probably have something that will fit in my generic o-ring set). Is this actually a MK5 and can someone tell me...

I've rebuilt my MK2 with the service kit from Vintage Double Hose to learn on something that wasn't valuable and it came out great and holds perfect IP, it is just limited by the number of LP ports. I just received a MK200 that appears to have piston blow-by in my bench testing and was...

Does anyone have a spare heavy yoke (7/16 thread or better yet 9/16 thread thumb screw/knob) for a MK5 sitting around (or a totally junked reg with one on it) that they would be willing to part with at a reasonable price? Mine has the 2400 psi yoke and I'd probably be ok diving it with 3k in...

Can you folks help me out with what I have here? Also, any other insight you may have. I purchased it cheap for the 109 reg that was attached to it, but it is nicer than my Vintage Mk2 with additional ports and I would like to service it and possibly put a 3k yoke on it. I believe it is a Mark...

I keep reading about these discontinued dive computers crapping out, so if there is anyone out who has replaced theirs and has the USB cable sitting in a drawer to sell me, that would be awesome. I know I can buy them new for $85, but I wouldn't pay that for a USB cable even if I just won the...

I really appreciate all of the knowledge and support provided by the members of this site and have been reading everything I can on "vintage" gear and regulator maintenance. I dive a modern reg set but recently picked up a really nice Conshelf SE2 primary and secondary which also had a super...