Scubapro D400 or G250

[halocline]

The late production D400's were badly detuned to meet CE freeflow requirements and this came on top of a switch to a replaceable plastic orifice that greatl;y reduced the potential performance.

And if your "G250" came with a Mk 25, the odds are it is a G250HP. They are not the same reg and the G250HP is by comparison a piece of mostly plastic crap.

These are both exellent points; I assumed that since the OP did not say "G250HP" his was the much better original G250. If his G250 is a G250HP, I would absolutely recommend keeping the D400, regardless of it's vintage.

I forgot about the late plastic orifice D400s; I've never seen one to I tend to forget they exist. If the OPs D400 is one of these, and the G250 is the original metal-barrel version, I'd keep that one.

I'm also not a particular fan of the MK25's external IP adjustment, although it's not that big an issue IMO. The original shim method is a little more labor intensive at rebuild time, but since these 1st stages can function extremely well with a wide range of IP, it's not that important to set them at a particular value. The shim method does produce VERY stable IP, and presents one less possible leak point.

 

[knowone]

Well I was going to say something but after listening to DA Aquamaster and mattboy there is nothing left to say and if I had I wouldn't have known half that stuff anyway so if it's 100% DIR 250 and may the force be with you. I'm also not very pleased that now I have to go into the shed and try and figure out which ones I, actually have.
Tanks fer nuttin.

I may have to succumb, bite down on a first stage and acquire some of those creeping machines and things.

 

[it_mike]

BTW, for the past few years the Mk25 has come with the G250V, for 'vintage'.