Prop shaft

[SRH]

What is this for first time seeing one?

[Michael Crouse]

That’s a shaft safety collar.

[SRH]

Thanks only thing I could think of.

[charlesml3]

Yes. It's a safety collar. The idea is, if you hit something it won't snatch the prop shaft out of the boat and sink it.

[h2oski]

It also keeps the prop from slamming into the rudder when you disconnect the transmission coupler when you check the alignment