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Re: Airmar / Raymarine DST800 Transducer Issue
The height of the geyser will depend on how far under water the fitting is. I pull mine to haul and launch (sling straps are bad for the wheel) and there's a gush, but I either clap my hand on it or fit the other (plug/transducer) quickly, but it's only about 1.4' below waterline. If it was a deeper hull, there'd be more pressure. Still just a moments work to sponge out the gush.
Previous boat did not have a flap, but was even shallower, so water just sort of flowed out.
Just make sure you fit SOMETHING back in the hole as quickly as possible, flap or no flap.
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1998 Jeanneau SO45.2