attic tank

attic tank

[′ad·ik ‚taŋk] (building construction) An open tank which is installed above the highest plumbing fixture in a building and which supplies water to the fixtures by gravity.

attic tank

An open tank which is installed above the highest plumbing fixture in a building (e.g., in the attic) and which supplies water to the fixtures by gravity; the filling of the tank is controlled by a float valve.