Originally Posted by Saltyhog
Is it ever a good idea to have seacocks on thruhulls that are above the waterline? I'm thinking of things like the chain-locker drains and the air-conditioning outlet. I'm not sure if it would be prudent to be able to close these for off-shore passages, or just a waste of bronze.
Does the boat sometimes heel when underway, putting those outlets below the waterline? If they could spend hours, or even days, in that position then what, really, differentiates them from, say, the motor cooling water
Probability of failure: low. Costs of failure: med to high.
Usually, tacking would get the failed point back above the waterline. But stuff happens, usually at inopportune moments. Worst case: clawing off a lee shore and a lee-side through hull
scrapes a rock.
Just my thoughts...