Marking the area for a thru-hull

[crazycarl]

It makes sense to play it as safe as one can.  In order for me to place the thru-hull just above the waterline, the sink will need to be raised 4" to 6" for the water to drain properly.

I should state, the boat is on it's trailer when not being sailed, so the possibility of something going wrong with no one present is minimized.  The ball valve will be closed whenever the sink is not in use. 

This is what I purchased for the thru-hull

[skip1930]

Two magnates was brilliant.
Their is a kit of two equal sized magnates that are used to wipe the inside of fish tank glass to remove the slime.
The outside magnate is covered in soft felt while the inside one is a cleaning stone.
They 'snap' together, sandwiching the glass, and just drag the felt one around to where you want to clean.

skip.

[Jon898]

Interesting choice of materials, crazycarl.  316SS valve, 316 nut and what appears to be a bronze through hull.  Why not stay with either SS or bronze throughout?  Bronze would be (a little) less expensive but might leave green streaks down your topsides.

Groco is a little coy about what type of bronze they use, so the mixture could be fine.  They do supply some SS fittings with bronze nuts, which implies (speculating here) that the machining of the fittings has activated the SS and made it galvanically very close to an aluminum bronze, so chances are you will be OK.  If the through hull is not Groco and turns out to be a silicon bronze, that would put the fitting half way between active or passive SS, in either case setting up a nice little battery cell if any moisture stays in the system.

[crazycarl]

Interesting choice of materials, crazycarl.  316SS valve, 316 nut and what appears to be a bronze through hull.  Why not stay with either SS or bronze throughout? 

All the components are bronze.  Could be the lighting that makes it look like SS.

The ball valve inside is SS, but it is also insulated from the bronze by teflon.


Carl

[Harrier]

Not a big concern for above the waterline, but here is a good article on brass/bronze fittings.
http://coxengineering.sharepoint.com/Pages/BrassandBronze.aspx