Thru hull

[crieders]

I looked on tech notes for removal and replacement and did find anything
On the internet there are various approaches

[Rick Roberts]

Since we changed our head to a compost head. We were able to get rid of 2 thru-holes (Thru-hull ?). Here's a video of it:
https://www.youtube.com/watch?v=V11wsyyqHu0&t=3s

[MarcZ]

Try Mainsails website

https://marinehowto.com/category/plumbing/

[Ron Hill]

Cliff : Look at your three thru hulls inside the door under the head sink.  One is for the engine raw water with the screw on filter, one is the head sink drain (follow the hose up to the sink)!!  and the other is for the raw water for head!!   

A few thoughts