- Joined
- Jun 26, 2018
- Messages
- 99
- Reaction score
- 5
- Points
- 8
- Age
- 65
- Location
- Long Island, NY
- Model
- Islander
Going solely off what he has written, it seems like a vent for the head system.It would help to know what the through hull is for. The original owners manual does not seem to have a hull through hull diagram