Leaking OPV

[5thDayDvr]

Oxycheq wing has a slow leaking OPV valve. I have taken it apart, can't see any cracks, cleaned it good but still leaks. Helpful hints would be most appreciated.

 

[scubafanatic]

...air up the wing and sink it in a water-filled tub and zero in on the exact nature/location of the leak....gotta begin at the beginning if you want to pin this down.