Scared Silly
Contributor
IMHO primary and secondary regs do not necessarily need to be exactly the same but it certainly does help if they are from the same mfg series. This also goes for for deco/stage regs. The reason being is that it makes it easier to field fix. The field being either under or above the water. That said all of my back gas regs are of one brand and type and all of my deco are of another brand and type.
The other important issue is that no matter the regs be for back, stage, or deco gas all should be DIN (perferably) or yoke.
The other important issue is that no matter the regs be for back, stage, or deco gas all should be DIN (perferably) or yoke.