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