Originally Posted by nigel1
On my paddle wheel
, the through hull
can either be removed as a complete unit, or, the center part comes out of the "sleeve".
The bottom of the "sleeve" has a non return flap that helps to reduce the amount of water
that enters the boat when the center part is removed.
This is similar to the set up I have.
This, I believe, is the answer. I have some through-hulls for my original instruments for the depth
and speed. The new instruments from B&G have a neat sleeve that allows me to insert it permanently, then install my new transducer inside the sleeve. The sole function of the sleeve is to put a small non-flooding flap in the through-hull which reduces the amount of water which enters the boat.
It is possible, especially when working by touch, to remove the larger piece (the sleeve AND transducer) which opens up a 2" hole in the boat. Not a big problem, but if you were anticipating a dribble, and instead you get a flood, it's a little disconcerting.
I think Airmar makes most of these bits on behalf of the instrument companies. Thankfully, this gives interchangeability as you move from company to company.
Alerion Express 38 Yawl "Surprise"