I'm confused, (which would not be the first time!).
A sea chest to me, is a single inlet in the hull (bottom) with one valve, which then either has a box or pipe, which then in turn has seacocks and hoses going from it to the various compents you wish to supply, IE:, A/C intake, generators, main engines, washdown pumps, etc. That way in the event of a catastrophic failure, you close one valve. It also gives you the ability to have only one sea strainer.
The picture I see, is a sump tank.
What are your intentions for what is in the picture?
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