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.
References in periodicals archive ?
On hot summer days with no wind when the attic tank was low on water, we climbed up onto the windmill platform and turned the big wheel by hand.
Your kitchen sink is connected, via a pipe, to the rising main, hence it's safe to drink that water, while the other taps and connections, including the hot water tank, are supplied by a low-pressure, gravity-fed system from the attic tank.
Annie Mitchell, of Oxford, cracked the pipe, causing gallons of water from the attic tank to spray all over her.