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post #6 of Old 05-06-2013
MarkSF
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Re: Raymarine ST40 speed transducer nearly sunk me

Is this the thru-hull that has a flap inside, to prevent most of the water entry while changing the plug?

Small chance this is the issue, but when Airmar changed the thru-hull for my DST800 transducer to include a flap, the transducer changed too. The new version is identified by a yellow O ring under the cap. Yellow O ring with flap, black O ring without flap.

Bristol 31.1, San Francisco Bay
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