Originally Posted by wscotterwin
My boat is a Brewer 44 Cutter and I am looking to install a new nav system. B&G looks to be the system but I am curious about the Plastic through hull for the Depth Sensor (DST800). Should I be concerned about plastic vs brass? Nothing else on this boat is plastic and I intend on extend cruising on this boat.
First, none are made of "brass", rather bronze.
Many, many boats use "plastic" thruhulls without problems. The don't corrode, or age in any significant way. They also don't blow out if the boat is hit by lightening. Marelon thruhulls and seacocks are very common on long distance cruisers. In fact metal boats will usually use them to avoid corrosion
The only type of boat that should NOT use plastic thruhulls are those made of wood. Swelling wood can crush the plastic. I would avoid them in an engine
room, just because they don't do well in a fire, but anywhere else on a boat, go for it.
But if you really are uncomfortable with plastic, you can get it in bronze or stainless as well.