The epoxy putty worked on the multiport valve.

I have another small leak from the filter bulkhead fittings that has me almost ready to throw in the towel. The bulkhead fittings have o-rings that seal them against the body of the filter tank. The tank and fitting seem to be made of the same material, a hard black plastic.

I have cleaned and lubed the o-rings, changed the o-rings, used two different sized o-rings from two different stores. Nothing has worked. The leak has only gotten worse. It is a Hayward Sta-clear DE filter.

Yesterday I used epoxy putty on it, figuring that if I ever needed to disassemble the bulkhead fittings, I would just replace the filter. Today I tested it and it still leaks past the epoxy putty. I may have screwed up when I applied the putty because I used another sealant/ adhesive first which made it difficult to get the epoxy to stick to the plastic. It kept wanting to come off with my finger.

I cannot understand why I could not get the o-rings to seal. It is like a union fitting. I looked but could not see any cracks though I am not sure what else it could be. Now the leak is so bad that I really cannot even use the filter. It leaks right at the joint where the o-rings should be sealing. I may try some jb weld on top of the epoxy I already put on. The next step seems to be a new filter. Very frustrating.