They say their is an inner and outer o-ring on the later one piece valve. I only see one o-ring. Is the other one located inside the valve? Thanks guys

 

Yes there are 2 seals but unless your OPRV looks like it has over heated or gave you issues I would leave the inner one alone. It takes some pretty hard pulling to separate the cylinder from the cap. Personally I did both seals since I wanted to find out how they went together on a spare I had. Lube the inner o-ring very well or it can roll out of the groove when you squeeze the two parts back together.

 

Oh yes!