Fiber optic light leak

Oct 30, 2014
Charleston SC
I've been dealing with an annoying leak lately and the ink test confirmed that the leak was around the lens for the fiber optic light. I am trying to take it apart to find the worn / damaged gasket / oring. I drained the water to below the light and fabricated a tool to unscrew the "lens nut" which looks just like the pentair 22100100 nut found here The plastic lens nut is cracked in one part but I don't think that's causing any leakage, I'm looking for a gasket or oring and do not see one in there. This diagram shows that if I unscrew the lens there will be an oring in there. I cannot figure out how to unscrew the lens and it doesn't budge with my fingers (it is recessed in the housing). Is there an easy way to do this?


Bama Rambler

Mod Squad
LifeTime Supporter
TFP Expert
Jun 23, 2009
SouthWest Alabama
If there are no cracks in the housing then it's most likely leaking behind the spacer with O-ring in the diagram linked. The first thing I'd do is replace the lens retaining nut and see if it'll tighten it enough to stop the leak. If that doesn't work you'll need to get enough slack in the fiber bundle and pull the light assembly out of the housing and replace the O-rings. If you're adventurous, you may want to pull the lens out and unscrew it and dry it out a little anyway.


In The Industry
Mar 8, 2011
I would replace them with LED products from Jandy, Savi, or hayward. You will like the much higer light output