Pressure rating question for Mk10 + yoke conversion

[elgoog]

Hi all -

I've seen yoke Mk10s with 3000psi stamped on them. Looking through some old posts on SB (from '03-'04), it looks like they are safe to use on HP steel tanks - the rental tanks we get are never more than 3200psi. Even at this pressure, some of the posts mentioned potential issues with some O-rings. Assuming the regulator is serviced and well cared for, is there something specific to watch out for in this regard?
Is the DIN Mk10 also rated for 3000psi? I assume so but wanted to confirm.

Also, can a DIN Mk10 be easily converted to yoke? Are parts readily available for this?

Thanks in advance,
elgoog

 

[whaylonsmithers]

Any DIN fitting will be rated to at least 230bar/3300psi. Your MK10 DIN fitting may be the short 230bar/3300psi one as opposed to the longer 300bar/4200psi one Scubapro currently use (which also goes into 230bar/3300psi tank valves). But it will definitely take 3000psi.

In all cases Yoke types will not exceed 230bar/3300psi rating and may be lower for older types (have seen Scubapro yoke marked at 4000 psi but it looked just like the 3300psi yokes that came before and after it). There's some fat in that but the higher the pressure the more likely you are to blow an o-ring.

There are two ways to turn DIN into yoke.
a. Din-to-yoke thread-on adaptor (example in link below). A new adaptor will almost certainly be rated 232bar/3300psi and your DIN fitting will not be less than that. Easily converted back and forth. Cheapest. Some folks don't like it because the the 1st stage sticks out a bit more from the tank and they bang their heads.
ScubaPro DIN to Yoke Adapter
b. Remove the DIN connector and fit a dedicated yoke one. Likely a dealer service which will cost a bit more. Best solution if you are exclusively diving yoke valves. Scubapro's current DIN fitting will go on the MK10, not sure if their current yoke will. If not someone may want to trade because DIN fittings are way more popular now than when SP were banging out the MK10s.

If you own your own tank another thought is to convert the tank valve/s to DIN with a yoke insert. This is a very flexible solution but the most expensive. Make sure you check the valve type if you do this. If you get 300bar valves (long DIN) and you have a 230bar reg (short DIN) it won't seal. And this is totally not what you were asking about either.