Ahh, but now I see that you just want to generate the vacuum with a column of water.
The coil won't work - you need 33.5 vertical feet in a column of water to match 14.5 psi. It's the only way to get the gravity to add up.
If you have a column of water descending 33 feet creating a vacuum space above it, then the water at the surface of that column will, in essence, boil. The vacuum space will have a considerable amount of water vapor in that volume. Will the presence of that "dampness" have an adverse effect on the curing process?
