Thru hull transducer mounting WARNING

[Dominic]

It has come to my attention that some NASA transducers that have been sealed with 'Silkaflex' have degraded the transducer material at the mounting flange to the point that the transducer flange on the outside of the hull has almost come off. It is suggested you mount these tranducers with a silicone sealant and glass-in the transducer on the inside of the hull...