Quote Originally Posted by Crazy685
Where can I buy a new oring for the powertube on a level 10? I recently just bought a RT valve with a level 10 installed and it leaks down the barrel. The guy I bought it from did say that it sat for a while, so it probably needs to be oiled and have the ring replaced.
If there is any where on the sear of the gun you are installing the valve in, the bolt probably sits farther forward. This could cause leaking if there are shims installed and it allows the vent hole to be exposed.

It probably just needs to be tuned. If the valve was tuned prior to you buying it, then it probably just sits in a different position from the setup it was tuned in. Remove all the shims from the powertube. If it still leaks, then tune it by using a smaller carrier size with the same white carrier oring.