Pool Skimmer Float Valve

float valve
A ballcock (also balltap or float valve) is a mechanism, or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow. The modern ballcock was invented by Joseph Bramah and Thomas Twyford.
A valve which is mechanically actuated by a float. Utilized on many cooling towers to control make-up water supply.
A mechanism that regulates fluid level by using a float to control the filling of water in the water tank; used in swamp coolers to regulate water levels.

skimmer
A device or craft designed to collect oil spilled on water
A utensil or device for removing a substance from the surface of a liquid
a rapid superficial reader
a cooking utensil used to skim fat from the surface of liquids
boater: a stiff hat made of straw with a flat crown
A person or thing that skims, in particular

pool
(of two or more people or organizations) Put (money or other assets) into a common fund
an excavation that is (usually) filled with water
Share (things) for the benefit of all those involved
join or form a pool of people
combine into a common fund; "We pooled resources"