Profile: Mercury Displacement Industries, Inc. manufactures liquid level controls in wide and narrow angle mechanical or mercury type floats. We also provide a wide variety of high temperature floats, vertical floats, and cord sets. We supply OEMs, 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 2 HP grinder/sewage pumps.