Sea cock & thru hulls

smiles bernard
 

Hi there
My maramu seems to have non marine ball valves fitted as seacocks

Whilst they look new I assume I should replace these with marelon or something equivalent

At the risk of asking a daft question . . These Amel Thru hulls are new to me. Is there a threaded section glassed into the through hull? If so is this metal or a plastic?
It'd be a great help to know before I attempt something stupid !

Many thanks in advance

Miles
Maramu #162

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