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Jr Gar is right in describing the process. I have been to the factory twice
and have seen the ovens/material(raw it has the consistency of fine sugar)
and the molds being built.. The water seeps through the thru hulls and fittings if they are not 100 % bedded and/or bonded. The foam is pumped into the void between the inner and outer hull then sealed. At that point it is water tight..untill you start drilling into and thru it adding the water intakes ,mounting the engine,side rails, rod holders,etc. The oem drains are located at the low point of the bilge and do not adress the void between inner and outer hull. I believe both brass and plastic have been used with equal success and it is a diy project. Just look at the photo's already posted and do not spare the rule elastomeric...
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