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That time frame was added after I posted...

None of the choices....the regulator is, with out it, there is no diving. The rest of the stuff is just nice to have.

I did a double take on this one too....why on earth would Bryan be asking this.

Rather than spray, use silicon grease instead, it is less prone to washing off

PLEASE don't add another blasted log in. This is a chat board, not a banking account.

!!*(&*!! I dont't like this new format....anyway I cant answer your question without having one in my hand. The thread size is just one aspect of the fit, mygu ess is it will not

I agree with you on the MK-5/10s great regs but I will challenge you on the longevity of parts. USD/AL Conshelf (diaphragm reg) was introduced in 1965 (56 yrs) and rebuild parts are still available. To be honest, both of these regs are anomalies from an age aspect but it does show a well...

I'll add a little to tbone, a damaged piston is the least of your worries. The piston will be at it's most extended (left in the above drawing) position when depressurized. If your tech did a poor packing job (or you did a poor job of rinsing a non-sealed piston reg) and salt water sets next to...

I don't have any more of them and at least for now have stopped making tools. No extra time these days.....but I may retire in the not too distant future and need something to do again. The threads on the port are 9/16-18

In many places the number of US style outlets are limited. I take an inexpensive power strip so I have more outlets as I am usually charging a number of items.

Another clearing method you might want to try that was used back in the day with mask that did not have nose pockets. Just press the mask squarely against your face so it seals a bit better, this will allow some pressure to build in the mask and blow out your nose. It's not as effective as...

I am interested in it for a few bucks to cut apart as a display

I won't make them for sale, liability is the first issue and they take a good bit of time since they are all "cut by hand" so not worth my time unless I am restoring a reg for which seats are unobtainium.

Found an OEM MK-2 kit The seat measures 0.1373in / 3.478mm tall .18275 in /4.631mm diameter

It's been a long time since I experimented with this but yea, I made some seats for piston regs in the past. I had some success doing it. As I recall, I was using nylon rods that I cut to length. Next time I get some shop time I'll see what I can come up with, I know I still have a lot of...

I suspect you know this but just in case you don't, the seat is pushed out by inserting a thin rod (blunt end of a small drill works well) up into the head of the piston then into the small hole behind the seat. You don't "dig" it out from the seat end.

If you are considering any flow through piston (MK-5/10) you should add a bullet tool. It's the one "necessary" tool for those regs. IMO,unless you plan to use high O2 concentrations, above 36% nitrox, Christolube is an expensive and unnecessary choice for a lube. The old standard, Dow 111...

I am going to take this in a different direction. From the description of the problem and the fact it's been doing this since new I am leaning toward either an incorrect oring was installed or incorrect machining. What the OP is describing sounds like excessive clearance in the gland for this...

Your Dacors are what I think of as advanced regs to service, not be because they are difficult but rather no parts kits are available for them so you have to get creative with parts. Trident sells some HP seats that may work so you might can get them and Dacor used pretty much standard orings...

Does USD count as Aqualung? I'll throw one in that you might not think of, the double hose Mistral. Few moving parts, completely sealed, no seals or orings to go bad and very simple. Add to that, there is no second stage to go bad because it does not have one. You can even re-polish the main...