Mains Fed Water Coolers

water coolers
Used to refer to the type of informal conversation or socializing among office workers that takes place in the communal area in which such a dispenser is located
(water cooler) a device for cooling and dispensing drinking water
A dispenser of cooled drinking water, typically used in office workplaces
The Water Coolers is a New York City–based music and comedy act performing original songs, sketch comedy and pop parodies about the daily challenges of modern life.
(Water Cooler) there are two types of water coolers. The corps coolers are 5 gallon drink coolers with a faucet on the bottom to fill up drink cups and the personal water coolers are from ? gallon to a gallon sized and come in many forms. (such as when the contra section uses a clean mini gas can)

mains
The open ocean
(main) any very large body of (salt) water
(main) chief(a): most important element; "the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"
A principal pipe carrying water or gas to buildings, or taking sewage from them
A principal cable carrying electricity
(main) a principal pipe in a system that distributes water or gas or electricity or that collects sewage

fed
(feeding) eating: the act of consuming food
Federal: any federal law-enforcement officer
Federal Reserve System: the central bank of the United States; incorporates 12 Federal Reserve branch banks and all national banks and state-chartered commercial banks and some trust companies; "the Fed seeks to control the United States economy by raising and lowering short-term interest rates
A federal agent or official, esp. a member of the FBI