SP MkV question

[mksmith713]

I have 2 Scuba Pro Mark V first stages.
I'm told that one is a 3000 PSI yoke while the other is a 2500 PSI yoke.
They look identicle....so what's different about these regs that makes them spec out differently?
Can the 2500 PSI be upgraded or rebuilt to make it a 3000 PSI reg?
If not, can it still be used with full AL80's with 3000 PSI rating?

 

[redacted]

The MK5 was produced with three different yokes over its course of production. The earliest was a noticably light looking yoke and used a 3/8ths inch yoke screw. The next was a somewhat heavier looking yoke with a 7/16ths inch yoke screw. The one yoke I have of this vintage has "3000" stamped in its base. Scubapro is now saying these yokes are limited to 2475 psi service. The final production models use the current 9/16ths inch yoke screw and are marked in the upper portion of the yoke "3000 psi". I use the modern yokes at pressures up to 3500 psi. I continue to use the 7/16th yoke at 3000 psi. I do not have any of the 3/8ths yokes. Older yokes can be replaced with modern Scubapro yokes but it may be very difficult to find the smooth chrome finish versions any more.

 

[mksmith713]

Waiting on the forum encyclopedia (DA) to chime in........

 

[DA Aquamaster]

Awap said it. The older shiny chrome yokes are getting hard to find, but the current sp yokes work just fine - they just don't match the regulator body.

The concern with the thinner yokes is the potential to stretch under pressure which could create enough gap to allow the tank valve o-ring to extrude.

 

[Wayward Son]

I just converted my MkV to DIN & have a 1978 3000 psi chrome yoke assembly from it.

 

[mksmith713]

Cool beans.
I was concerned that there might be a mechanical difference vs. a structural difference.
Repalcing is a yoke is fairly simple task.
I can probably find one cheap on eBay.

 

[HenrikBP]

I just converted my MkV to DIN & have a 1978 3000 psi chrome yoke assembly from it.

I thought the MKV DIN connectors were "unobtainium" parts? Something about them needing a different DIN than the MK10 and later models. Do you have a part number or other pointer to what you got?

Thanks

Henrik

 

[Wayward Son]

I got one that had been sitting on a dive shop shelf for years

 

[HenrikBP]

I got one that had been sitting on a dive shop shelf for years

Oh thanks ... that's a great help Just kidding - congrats on a great find. I guess my search continues.

Now, DIN for MK10 1st stages - as far as I understand - are easier to come by. Correct?

Henrik

 

[DA Aquamaster]

Yes, the Mk 10 uses the standard "universal din connection that SP uses on everything besides the Mk 5.