The culprit

I have an annoying leak on the boat and think I have finally located it.
These two fittings are the prime suspects. The one on the right I replaced last year and by observing it for some time it does not appear to be weeping.
The one on the left however seems to be permanently wet and the liberally plastered bathroom sealant is a dead giveaway.
Unfortunately I have to take the boat out of the water to effect a repair…..