MAIN The principal pipe artery to which branches are connected.
MACERATING TOILET SYSTEM An assembly consisting of a water closet and sump with a macerating pump that is designed to collect, grind and pump wastes from the water closet and up to two other fixtures connected to the pump. > Sump Pump Repair
MECHANICAL JOINT A connection between pipes, fittings or pipes and fittings that is not screwed, caulked, threaded, soldered, solvent cemented, brazed or welded. A joint in which compression is applied along the centerline of the pieces being joined. In some applications, the joint is part of a coupling, fitting or adapter. - Columbus Plumbers
MEDICAL VACCUM SYSTEMS A system consisting of central-vacuum-producing equipment with pressure and operating controls, shutoff valves, alarm warning systems, gauges and a network of piping extending to and terminating with suitable station inlets at locations where patient suction may be required. Columbus Drain Cleaning