Interchangability of thru-hull transducer makes

[EricP1]

My boat currently has a mid-90's Raymarine Tridata instrument with the depth and speed thru-hull transducers. This is probably a dumb question but if I am looking to replace those transducers with another make do I need to install new thru-hull casings/housings? To state it differently, there isn't a universal size for thru-hull transducers, is there?

Thanks,
Eric

[tommays]

There is no one size fits all BUT Airmar for example made them for a LOT of different brands and offers a lot of of interchanges

[emoney]

You might get lucky and find at least the same diameter housing. May still need to change it, but at least you won't be making a bigger hole.