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M Tubing:
An industry standard for copper tubing defined by the tube wall thickness. Identified by a "red" stripe.

A device installed in a drain line between a toilet and the soil stack to reduce solids to liquid form.

One of the elements in the earth's crust, the compounds of which when dissolved in water make the water hard. The presence of magnesium in water is a factor contributing to the formation of scale and insoluble soap curds.

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 Fitting:
Fitting that is inserted into another fitting.

Male Threads:
The threads of the pipe are on the outside.

Male IPS (MIP):
Male Iron Pipe - Standard external threads on pipe and fittings.

Malleable Fittings:
Fittings made of cast iron. Metal which is soft and pliable.

An element sometimes found dissolved in ground water, usually with dissolved iron but in lower concentration; causes black stains and other problems similar to iron. It can be removed by a water softener or it can be precipitated by chlorine at a pH of 9.5 or above.

Manganese Greensand:
Greensand which has been processed to incorporate in its pores and on its surface the higher oxides of manganese. The product has a mild oxidizing power, and is often used in the oxidation and precipitation of iron, manganese and/or hydrogen sulfide, and in their removal from water.

Access opening to a hole, usually with a cover, through which a person may enter a sewer, boiler, drain, etc..

A fitting that connects a number of branches to the main; serves as a distribution point.

Manifold Pressure:
The gas pressure in an appliance manifold upstream of the burner orifices.

Manifolded Installation:
Paralleling of water heaters for large hot water demand applications.

Mapp Gas:
A colorless, flammable gas made by combining liquefied petroleum gas with Methylacetylene-Propadiene. It is a stable, non-toxic fuel used in brazing and soldering.

MC Tank:
Acetylene tank holding 10cu.ft. of gas, used for plumbing, and once used to fuel motorcycles.

Maximum Contanimant Level - The maximum level of a contaminant allowed in water by federal law. Based on health effects and currently available treatment methods.

Mechanical Controls:
Dials, slides, switches, knobs, buttons, and so forth used to operate ranges, ovens and cooktops.

The wiring, plumbing, and heating and cooling systems in a building; also the components with moving parts such as furnaces, plumbing fixtures, etc.

Metal Fatigue:
A breakage of the metal caused by the bending and flexing or the expansion and contraction of a metal part beyond its endurance limit.

Meter Tailpiece:
An adapter connecting a water meter to the water supply line.

Meter Tile:
The cylindrically shapedcasing that forms the pit to hold a water meter. It's usually made of plastic.

Metering Faucet:
Faucet which delivers a predetermined volume of water and then automatically shuts off.

Male Hose Threads (threads on outside of connection).

A unit of measure, one thousandth of a meter. Used to describe the pore size of filters.

One thousandth of a volt.

Minimum Run Time:
The minimum length of time that the pump should run while refilling the pressure tank.

A special style of bathroom lavatory faucet having separate spout and handles, but designed small enough that it will fit 4" center-to-center faucet holes.

Mission Coupling:
A neoprene flex coupling, connecting PVC to PVC or clay to PVC.

The portion of a burner where air and gas are mixed before delivery to the burner ports.

Mixing Valve:
Mixes hot and cold water to achieve a specified delivery temperature.

This refers to the male pipe thread, in which the threads are on the outer side on the connection fitting.

A blend of ceramic-like quartz (70%) and acrylic polymer (30%) that is impervious to chips or water spots.

Monitor Cover:
The cast iron lid that fits over a flange casting which is mounted on meter tile in a water meter pit. It consists of an outer lid, an inner lid, and the flange casting in one or two pieces.

Monobloc Faucet:
A single-handle faucet, usually a lever.

Most Probable Number (MPN):
The term used to indicate the number of organisms which, according to statistical theory, would be most likely to produce the results observed in certain bacteriological tests; usually expressed as a number in 100 ml of water.

Male Pipe Swivel Connection.

Methyl Tertiary Butyl Ether. Used in gasoline to reduce air pollution, MTBE has been known to taint drinking water from leaking underground fuel storage tanks.

Multiport Valve:
Rotary type backwash valve. Can replace up to 6 gate valves.

Multi-stage Pump:
A pump that has more than one impeller.

Municipal Water:
Water supplied by a city for public use; tap water. Usually held in a reservoir.

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