The EMCO float level switches are designed to control the liquid level in vessels containing corrosive or non-corrosive liquids. The EMCO float switch can be mounted horizontally or vertically, but horizontal mounting is the most common. The float lever carries a permanent magnet which is opposed by a similar magnet mounted in the switch housing. The magnets having the same pole directed toward each other are separated by a non magnetic diaphragm. The glandless construction offers excellent sealing.