Mercury Displacement Industries Inc (MDI Inc) has been around since 1975 and has since entrenched itself as a premier manufacture of Liquid Level Control Float Switches, Mercury Contactors, Relays, Tilt Switches, Solid State Relays and are now a proud distributor of a variety of Grinder & Sewage Pumps. We supply OEM's, Plumbing Supply companies, Contractors, Municipal Sewage Treatment plants, and Control Panel Specialists as well as many other industries .
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