"Paul Hovnanian P.E." wrote in message
...
Joe Blizzard wrote:

"Paul Hovnanian P.E." wrote
Does the brass/galvanized iron interface cause this kind of corrosion?

Probably contributes to it, brass and zinc/galvanized-steel being at
opposite ends of the galvanic scale. Maybe a stainless steel chain would
fare better. Taking the brass out of direct contact with with the steel
would reduce but probably not totally eliminate galvanic current.
Painting
the brass might help. Simplest thing might be to pull it up every 2-3
years
for maintenance.

I can isolate the brass check valve from the plumbing pretty easily with
a PVC fitting. Painting the brass probably won't work since it has
internal surfaces such as valve seats that won't take paint.

I'm wondering about the rest of the structure. The supporting post cast
into the concrete is galvanized, as are some nuts, bolts and clamps.
Stainless steel will get quite espensive. The chain is a no-brainer. A
piece of nylon rope will suffice.

Thanks to everyone for the advice.

--
Paul Hovnanian
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Stainless is a waste. Submerged, stainless is not stainless. Takes air to
cause the oxides that make it stainless. Monel, would work, but you could
probably put in a lift and a newer boat for the cost of a chain.