"Joe" wrote

I've seen just that problem on an aluminum boat with bronze seacocks.
The surface contact is so small the electrolysis cuts thru the through
hull threads like a laser, they can just fall off. Was able to break
them all off by hand right before a USCG inspection.

Yikes! I don't care how you do it. If bronze touches aluminum in salt
water, something very bad is going to happen very quickly. Those through
hulls would have failed even if properly threaded.

--
Roger Long