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Old 06-05-2018, 04:54 PM
Senior MemberCaptains Club Member
Join Date: Apr 2006
Posts: 8,655

You don't see garboard plugs with long neck s because you generally don't extend the wood/composite core all the way to the drain.

Most manufacturers and rebuilders leave the area around the drain void of a core and compensate by using many layers of glass resulting in a thickness of 1/2 to 3/4"
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