On Thu, 26 Jun 2008 12:41:06 +1000, "Oliver Fleming"
wrote:

These are made by Airmar, but does anybody have any idea why these
transducer fail prematurely.

Probably due to incorrect installation. Airmar makes a lot of
transducers and most of them are pretty solid.

Give them a call at 603-673-9570

or

http://www.airmartechnology.com/uplo.../ContactUs.htm