My guess is that this is the gas tank vent? Comes out of the back port side of my Sea Nymph. Looks like maybe there was a thread on vent cover for it that broke off at some point? I'm guessing you want some sort of vent shield over it so water doesn't splash in easily.
I took a guess at a cheap part but it didn't end up fitting.
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I took a guess at a cheap part but it didn't end up fitting.

Sent from my SM-G975U using Tapatalk