Proper sink drain

[catakate]

Originally Posted by jeremiason

Marelon will work fine... It is ABYC approved, is much lighter bronze, has no metal to corrode or be grounded and will be significantly cheaper.

That may be the case in US but chandlery price in UK for a 1 1/4" Seacocks is £66.95. Nowhere near cheap by my standards

Is brass sea safe? Except for the thru hull piece, I can source everything in brass at much lower prices.

[jeremiason]

[QUOTE=catakate;1185047]That may be the case in US but chandlery price in UK for a 1 1/4" Seacocks is £66.95. Nowhere near cheap by my standards
QUOTE]

So your saying Marelon Seacocks are more expensive than Brass Seacocks in the UK?

In the USA, Marelon is at least half the cost of Brass or Bronze Seacocks.

[cal40john]

Originally Posted by catakate

That may be the case in US but chandlery price in UK for a 1 1/4" Seacocks is £66.95. Nowhere near cheap by my standards

Is brass sea safe? Except for the thru hull piece, I can source everything in brass at much lower prices.

Brass is up to 40% zinc, the metal you use to dissolve away to protect other pieces of metal on your boat. That said apparently it is relatively common for boat manufacturers to use brass and expect you to replace it in 5-10 years.

John

[catakate]

I omitted to mention my boat is a trailer sailer. Plastic thru hull in plain sunlight, even in the winter, is no good. Too much zinc in brass for my taste so there I see 2 options left but no-one mentioned Stainless Steel. Why?

[cal40john]

Originally Posted by catakate

I omitted to mention my boat is a trailer sailer. Plastic thru hull in plain sunlight, even in the winter, is no good. Too much zinc in brass for my taste so there I see 2 options left but no-one mentioned Stainless Steel. Why?

If stagnant water, no oxygen, remains in contact with stainless it corrodes.

keelbolt example:
A wet bilge is MORE than just a nuisance ! - SailNet Community

OK, try titanium:
Thru-Hulls - Titanium

[atoll]

some photos as promised

cost involved in the uk
bronze skin fitting,£12
nickle plated ball valve£17
nipple £8
hose£6
2 hose clamps £3.50
pu sealant(sikaflex)£3.50
total £50

[catakate]

Originally Posted by cal40john

OK, try titanium

Nice, even cheaper then I'd expect, but not for me right now.

[catakate]

Originally Posted by cal40john

If stagnant water, no oxygen, remains in contact with stainless it corrodes.

I read a lot from Maine Sail's experience but thanks, I missed that. Still, as he explains, it's not an issue if properly maintained. On a trailer sailer even a lot easier to maintain.

Originally Posted by atoll

some photos as promised

thanks a lot, I see the sink has an overflow, right?
also, what size is the inlet?

[atoll]

this is a standard domestic sink with an overflow to the drain/plug fitting.
outlet is standard 1 1/2 inch pvc plumbing pipe about 40 mm

nipple on sea cock is 38mm as is the reinforced hose,you will need to heat the hose to get it to fit on the sink outlet

[atoll]

here is a shot of the sink installation as well

[catakate]

Originally Posted by atoll

here is a shot of the sink installation as well

Nice job you did, lucky girl to have such a father

What size is the inlet thru hull please?

[atoll]

1 1/4 inch,with a 38mmx 1 1/4 nipple

[Stu Jackson]

One of the issues with boat sinks is that many have the bottom of the sink very close to the waterline, so there is not enough "head" from the atmosphere "pushing" the water down. Smaller boats are very often compromised this way, and no vent will solve that issue. Vents on boats are not required as clearly explained before.

[catakate]

Originally Posted by atoll

1 1/4 inch,with a 38mmx 1 1/4 nipple

Sorry I asked again, from the picture the water inlet looks smaller then the outlet..

[jeremiason]

Originally Posted by atoll

some photos as promised

cost involved in the uk
bronze skin fitting,£12
nickle plated ball valve£17
nipple £8
hose£6
2 hose clamps £3.50
pu sealant(sikaflex)£3.50
total £50

I assume the ball valve is brass... Are you woried about the disimilar metals between the Skin Fitting and the Ball Valve?