on/off valve leaking

[shinymag]

I have a large leak coming from my on/off valve in my classic valve automag. The o-rings inside have no visable damage. Any suggestions?

[athomas]

Try lots of lubricant and cycle the gun. Then press and hold the trigger. Listen for a leak. A leak in the on/off with the trigger held will ound like a lawn sprinkler (psst psst psst). If the bottom o-ring on the outside of the on/off assembly is bad it will cause lots of leaking out the bottom of the valve. It rarely happens though, because it is tight and doesn't move.