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The 1986 edition of Dr. John Watt's Evaporative Air Conditioning Handbook identifies the origins for modern American evaporative cooling as either from the East Coast or Southwest. In the early 1900s, air washers were invented in the East and air coolers were developed in Southwest (Arizona and California).
The reason we designed and patented our drain plug was because there has been a serious problem with these coolers. The coolers vacuum seal so tight, the lid is almost impossible to open; our drain plug has a vacuum relief valve installed to reduce the pressure when the plug is pressed. MillHouse Manufacturing realized there would be a market for the plugs when these higher end coolers became more popular.