Originally Posted by IVIonster
Cup seal ? How do I get to it ?
your not going to get to it without a valve tool. the cup seal is part of the valve in the very front of the lower tube. you will have to take the entire lower tube out to get at it. i'm sure there's a tutorial around here some where. but untill you have a valve tool dont bother. and rebel is right the marker will still work fine. my karni had the same thing. and i have a valve and tons of valves. gun shot fine leaky valve and all. didnt care enough to fix it until i actually sold it.