Join Date: Jul 2000
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What type depth finder do you have?
The main reason for using a PVC pipe or other container for a fluid is to provide a level mounting position for the transducer.
It is usually difficult to find a level spot on the hull to mount the transducer. If it isn''t level, the beam is directed down at an angle and the depth you are reading will be in error by the degree of the angle.
A PVC pipe/container can be beveled to match the angle of the hull and allow the transducer to be mounted vertically. The fluid is needed to maintain a low loss path between the transducer and the hull/water.