Thru-Hull fittings

Dear friends, BCC “Mimi” (Hull 053) changed hands. I am the new and proud owner. The survey was great and there were ho major issues… However I am having some problems with the sea cocks. The screw of head discharge broke. There is a metal level at the opposite side. I don’t know what is it for. Do I have to replace the whole thing? Also the handles of the head and engine water intake are not working properly. Should I replace them? Any suggestions?

Mehmet
Owings MD