Thru-Hull transducers??

[Colliw11]

Hey guys just got the boat and it has (3) through hulls from the old electronics.. I assume that they are junk since all electronics were original from 1997. Does anyone know why there were (3), i'm only going to need (1) going forward. What should I do with the Other 2.?

 

[mleads310]

Not sure on the others but the large one with the fairing block on it, paddle in the middle, I believe is a b744 which is a decent non chirp transducer. All the transducers should have tags within a foot or so of where it goes thru hull.