Fix for leaking flush caps

[MrMoose]

My flush caps started to leak last season, and although a couple of table spoons of water finding its way to the deck drain is no big deal, it bothered me because they shouldn't leak.
I decided to try to fix it. I assumed that buying new caps would just get me back to where I am now, so I decided to try something, and it worked.
I trimmed the outer circumference of a garden hose gasket so that it fit into the cap. Works perfectly! Sorry, no pic, but I think that you get the idea.
If you're anal about keeping water on the outside of your boat, then this is a really easy fix.

 

[ripler]

Mine leak some times and when they do I just take the flush adapter and cycle the spring in the receptacle (not sure what in the hell they are called) and tighten down on the cap hard. Gonna try your trick, did you buy a thinnest garden hose gasket that you could find.

 

[MrMoose]

Mine leak some times and when they do I just take the flush adapter and cycle the spring in the receptacle (not sure what in the hell they are called) and tighten down on the cap hard. Gonna try your trick, did you buy a thinnest garden hose gasket that you could find.

@ripler , as for most of my fixes, I walk around my garage looking around to get ideas of ways to fix. I was originally looking for a piece of gasket material that I knew I had "somewhere" and eventually spied some spare/used rubber hose washers. I used the thinnest and softest ones that I had on hand. Once inserted, they were flush with the inner ring in the cap if that helps.
Before the hose washer fix, giving the caps an extra tightening initially corrected the problem, but they eventually started leaking again. I didn't want to over tighten and cause more problems.
I'd estimate that my gasket/rubber washer was about an eighth of an inch thick, and I shaved off less than a sixty-fourth of an inch around the outside.