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post #36 of Old 05-07-2012
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Re: Dead Reckoning

Originally Posted by jackdale View Post
Knotmeters must have a blank plug that is used when the knotmeter is pulled.

"Modern" knotmeters have a flap that stems the flow when the knotmeter is removed.
How can a plastic plug meet ABYC standards ( I assume it does) when requirements are so strict for thru hull valves?
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