Your ss welding looks quite good. Unfortunately I don't have a reliable SS welder here who does not cost beaucoup bucks. I am interested in the raw water connection. Is that just a straight hose connection about 3" down from the elbow?
Also is this type of T connection frequently used and reliable insofar as not getting raw water up into the manifold?[/QUOTE]
Actually that was pretty ugly stick welding, if i'd had a pulse TIG or a mig it would be prettier but its effective.
Yes thats a straight hose connection. I angled it downwards so water cant go up. It has proved to be problem free for a few years now. Yes I've seen more like that.
Its much better than yanmars design that relies on the integrity of the inner wall to stop raw water getting into the manifold. See attached pic
Mind you I dont know if your 3ym30
has the same type of elbow.
Sorry couldnt attach image but if you go to page 3 on this thread you will see a cutaway of mixing elbow, https://www.cruisersforum.com/forums...-103029-3.html
I would put an outlet fitting to match hose size but i'm not expert enough to say wether it is essential.