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Welcome to MDI Inc.

At Mercury Displacement Industries we manufacture the Liquid Level Control Float Switch in Wide and Narrow angle mechanical or mercury type. A wide variety of High Temperature float switches, Twin & Vertical Float switches, and cord sets available. We supply OEM's, Plumbing Supply companies, Contractors, Municipal Sewage Treatment plants, and Control Panel Specialists. We also manufacture Mercury Contactors, Relays, Tilt Switches, Solid State Relays and Timers. We now sell a variety of Grinder Pumps & Sewage Pumps.

Please call us at (800) 634-4077 / (269) 663-8574 or Fax (269) 663-2924

Add-Ons & Themes


5 Responsive Themes in one. Fire, Water, Earth, Wind or Aether - You Decide.