What do you mean by proper seacock? The type with the triangular mounting plate and holes for screws?
The brass through hull fitting for the baitwell pump that I got from Merritt also has two scew holes for mounting it in addition to the locknut itself. I like that since it will help with preventing any side twisting/turning of the fitting when/if I have to unscrew the seacock or pump. Like BarryB has stated, I will need to beef up around the through hull's locking nut also with roplene - I bought one of those rod welders (the cheap one) that Carl demonstrated on the DVD.
Yea, inner mounying flange. I actually use marelon fittings on my 170 so I don't have to worry about dissimilar metals causing corrosion (and using plastic on a plastic boat makes sense to me)
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