Originally Posted by Fubarius
The seal might not need replacing. Often Raptors are dry fired too much (cocking and pulling the trigger with no air source on the gun), this causes a dent on the back side of the valve which jams the valve pin open.
Pull out the valve and check that the valve pin slides freely in and out of the valve.
im a little bit of a durp with BE guns.....
i am not even sure where this valve pin is...
it has been dry fired i will tell you this..