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Main - The primary artery of supply of the water supply or drain system in which all the branches connect. In the case of drains, known as the Main Vent.
Male Threads - Threads on the outside of pipes and fittings.
Malleable Fittings - Fittings made of metal which is soft and pliable.
Manifold - A fitting that connects a number of branches to the main; serves as a distribution point.
Mechanicals - The wiring, plumbing and heating and cooling systems in a building; also the components with moving parts such as furnaces, plumbing fixtures, etc.
Multi-Stage Pump - A pump that has more than one impeller.
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