It's also worth noting that plastic fittings are not rated for use below the water line as well, Marelon is the only exception.
My live well pump was not working properly while on a three day trip last week. After I got home I started to remove the pump and I bumped the live well overflow hose and noticed that the thru hull fitting moved. It was about completely broken it discharges under water. I am glad that the pump gave me a problem because if the fitting had completely broken it would have flooded the boat. We all need to check theses fitting on a regular basic. I did go ahead and replace both hull fitting that are under water. There was not a problem with the pump it was the fill-drain valve.
It's also worth noting that plastic fittings are not rated for use below the water line as well, Marelon is the only exception.
I have replaced them with what I could find at Academy for a quick fix. I am going to find some brass ones but due to the COVID there seams to be a shortage of marine parts in this area.
It is fiberglass, but thanks for the info. I checked and the brass or bronze is on the expensive side but I think they will be worth it.
Considering what its for I would want the best. Beats sinking.