Replacing o-ring on male end of spg hose

[randykiw]

I need to relpace the 0-ring on the spg hose end that goes into the regulator 1st stage. (Scubapro mk17) I bought some 012 viton o rings but they seem alittle loose when they are on the male end, not tight like the one I removed. Is that the correct size o ring and is this normal?

 

[timle]

I believe that is the standard size for most HP ports on first stages. However I believe most scubapros take 011 for this application.

 

[Couv]

Delete
Edit: Timle got here first.

 

[randykiw]

really 011? The spg hose is standard and the o ring goes on it not on the 1st stage. I don't understand why the scubapro would need a different size?

 

[Couv]

I see a few references on the web that say different, but if the hose threads into a SP hp port (unless it is a really old regulator) it takes an -011.

Couv

 

[randykiw]

thanks - I will pick a few of those up.

 

[Texfrazer]

I don't understand why the scubapro would need a different size?

Because.

 

[randykiw]

Good old Italian engineering I guess.