Mercury Displacement Industries manufactures Liquid Level Controls in wide and narrow angle mechanical or mercury type floats.  A wide variety of High Temperature Floats, Vertical Floats, and Cord Sets are available.   Their products can be found in many different industries, like, OEM's, Plumbing Supply Companies, Contractors, Municipal Sewage Treatment plants, and Control Panel Specialists.  They also manufacture Mercury Contactors, Relays, Tilt Switches, Solid State Relays and Timers.