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TERM
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EXPLANATION
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"M" Tubing |
An industry standard for copper tubing defined
by the tube wall thickness, identified by a "red" stripe |
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MC Tank |
Acetylene tank holding 10 cu.ft. of gas, used
for plumbing, once used to fuel motorcycles. |
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MCL |
Maximum Contaminant Level
The maximum level of a contaminant allowed in water by federal law. Based
on health effects and currently available treatment methods. |
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MHT |
Male Hose Threads (threads
on outside of connection). |
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MIPC |
Male Iron Pipe Connection.
Standard external threads on pipe and fittings. |
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MNPT |
Refers to the male pipe thread, in which the
threads are on the outer side on the connection fitting. |
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MPN |
See
Most Probable Number. |
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MPX |
Male Pipe Swivel Connection. |
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Macerator |
A device installed in a drain line between
a toilet and the soil stack to reduce solids to liquid form.
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Magnesium |
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. |
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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. |
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Male Fitting |
Fitting that is inserted into another fitting. |
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Male Threads |
Threads on the outside of pipes and fittings. |
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Malleable Fittings |
Fittings made of cast iron. Metal which is
soft and pliable. |
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Manganese |
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. |
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Manganese Greensand |
Greensand that 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. |
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Manhole |
Access opening to a hole, usually with a cover,
through which a person may enter a sewer, boiler, drain, etc. (usually
round to prevent the cover from falling into the opening).
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Manifold |
A fitting that connects a number of branches
to the main; serves as a distribution point. |
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Manifold Pressure |
The gas pressure in an appliance manifold
upstream of the burner orifices. |
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Manifolded Installation
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Paralleling of water heaters for large hot
water demand applications. |
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Mapp Gas |
A colorless, flammable gas made by combining
liquified petroleum gas with Methylacetylene-Propadiene. It is a stable,
non-toxic fuel used in brazing and soldering. |
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Mechanic's Lien |
A lien obtained by an unpaid subcontractor
or supplier through the courts. When enforced, real property - such as
your home - can be sold to pay the subcontractor or supplier
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Mechanical Controls |
Dials, slides, switches, knobs, buttons, and
so forth used to operate ranges, ovens and cook-tops. |
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Mechanicals |
The wiring, plumbing and heating and cooling
systems in a building; also the components with moving parts such as furnaces,
plumbing fixtures, etc. |
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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. |
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Meter Tailpiece |
An adapter connecting a water meter to the
water supply line. |
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Meter Tile |
The cylindrically shaped casing that forms
the pit to hold a water meter. It's usually made of plastic.
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Micron |
A unit of measure, one thousandth of a meter.
Used to describe the pore size of filters. |
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Millivolt |
One thousandth of a volt. |
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Mini-Widespread |
A special style of bathroom lav faucet having
separate spout and handles, but small enough to fit 4 inch center-to-center
faucet holes. |
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Minimum Run Time |
The minimum length of time that the pump should
run while refilling the pressure tank. |
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Mission Coupling |
A neoprene flex coupling, connecting pvc to
pvc or clay to pvc. |
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Mixer |
The portion of a burner where air and gas
are mixed before delivery to the burner ports. |
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Mixing Valve |
Mixes hot and cold water to achieve a specified
delivery temperature. |
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Moenstone³ |
A blend of ceramic-like quartz (70%) and acrylic
polymer (30%) that is impervious to chips or water spots. |
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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.
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Monobloc Faucet |
A single-handle faucet, usually a lever.
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Most
Probable Number |
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 |
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Multi-Port Valve |
Rotary type backwash valve. Can replace up
to 6 regular gate valves. Serves various functions. |
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Multi-Stage Pump |
A pump that has more than one impeller.
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Municipal Water |
Water supplied by a city for public use; tap
water. Usually held in a reservoir. |
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