Garboard Drain

[ghebbns]

Hi all,

The previous owner had drilled a hole for a garboard drain in the bilge.  The plan for today was to install the thruhull (which he had provided).  Of course things did not go as planned.  The bilge compartment where the backing nut threads is not perpendicular so the nut will not tighten flush.  OK, we plan to make a washer that is thicker on one side than the other to compensate for this.  I am fairly confident this will work, but have two questions.

One, when cleaning the thruhull (which I thought was bronze), it got very shiny so now I am thinking it is brass.  I have read Mainesail's articles and I know to be wary of brass, but is this only if it is combined with bronze?  Should a brass thruhull be ok?

Two, in tightening the cap on the thruhull, I can only get between 2 and 3 threads.  I think it is an issue of NPT and NPS threads.  Is this enough to prevent water from leaking in?

Thanks,

Greg

[Fuzzy]

Greg:  Your thru hulls are probably bronze.  You do NOT want brass.
Larry