What model Scubapro 1st stage is this?

[jonniex]

Hello which model Scubapro 1st stage is this?

It look like its in great shape and I like it a lot. I got it off ebay but would like more information about it so that I can use it and service it properly. Any information would be appreciated!


Thanks

Jonathan

 

[DA Aquamaster]

It's hard to tell without a closer look but it is either a Mk 3 or a MK 200. From the shape/date of the yoke I suspect it is a Mk 200. The major difference is the size of the piston used inside the regulator. Both perform well and are basically the same as the Mk 2 but with one less low pressure port.

 

[DennisW]

I agree, my MK 200 doesn't have the wing nut, it is a newer version. The only problem with the MK200 is if you have to replace the piston, which is rare, you can't. There are no more of them and Scubapro doesn't make the part any longer. They are both great regulators.

 

[DA Aquamaster]

The yoke has that slight step in it about 1/6 of the way down the lenght of it - that post dates the Mk 3 and predates the newer yoke styles used on the Mk 2 and Mk 2 Plus. The wing nut is easy to replace with a standard SP yoke screw and the cost is about $6.00. You can also upgrade it for a DN connection with SP's universal DIN conversion kit. I use DIN converted Mk 3's and Mk 200's for my deco regs as they are bullet proof in terms of reliability.

Not having a new piston available is not as bad as it sounds as it is an unbalanced first stage where the piston holds a replaceable seat rather than having a seating edge like a balanced piston regulator. So...short of a nuclear war or beating it with a hammer, there is not much you can do to make the piston become unserviceable.

 

[DennisW]

The yoke has that slight step in it about 1/6 of the way down the lenght of it - that post dates the Mk 3 and predates the newer yoke styles used on the Mk 2 and Mk 2 Plus. The wing nut is easy to replace with a standard SP yoke screw and the cost is about $6.00. You can also upgrade it for a DN connection with SP's universal DIN conversion kit. I use DIN converted Mk 3's and Mk 200's for my deco regs as they are bullet proof in terms of reliability.

Not having a new piston available is not as bad as it sounds as it is an unbalanced first stage where the piston holds a replaceable seat rather than having a seating edge like a balanced piston regulator. So...short of a nuclear war or beating it with a hammer, there is not much you can do to make the piston become unserviceable.

You are pretty much correct about the piston. I have heard of techs insisting on a replacement because of a small amount of corrosion. Shoot, clean it up, spray it with silicon spray, put a new seat in it, and go diving.

 

[DA Aquamaster]

Unless the corrosion is on the stem where the o-ring seals against it, a little corrosion is not an issue.