There is a synthetic fitting called Marelon. It is the only thing besides Bronze that should be used below the waterline. Bronze is the best underwater fitting I know of.
Never use plastic or any metals like stainless, aluminum, brass, copper or steel.
The cold and heat can degrade plastic over time and cause it to crack.
Most quality boat builders follow ABYC and ABYC standards which say zero plastics below the water line.
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