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Natural Gas:
A colorless, odorless fuel derived from the earth, consisting primarily of Methane. Odors are added to aid in leak detection.


Negative Pressure:
Less than atmospheric pressure.


NEMA:
National Electrical Manufacturers Association.


Neo-Angle:
Term used to describe shower receptor or bathtub that fits into a corner. Two corner walls butt up against the fixture.


Net Usable BTU:
The portion of a fuel's heat energy actually transferred into the water by a heater.


NH:
No Hub.


Nipple:
A short length of pipe installed between coupling or other fittings.


Nipple Extractor:
A tool used to unscrew sections of pipe.


NKBA:
National Kitchen and Bath Association.


No-Hub Connector:
A connector for no-hub iron pipe consisting of a rubber sleeve and a stainless steel band secured by hose clamps. A variation, a neoprene sleeve with two adjustable steel bands, is used for connecting dissimilar materials, as when connecting new plastic pipe to an existing cast-iron drainpipe.


Nom:
Nominal. Usually refers to the inside diameter of trade sizes of copper pipe and some CPVC pipes. Not for iron pipe connections. For example, a 1/2" Nom comp. fitting is actually 5/8" because 1/2" pipe has an OD of 5/8".


Nominal Size:
Size used for identification only; not literal dimensions.


Non-CFC:
Foam insulation that minimizes the use of Chlorofluorocarbons.


Non-ferrous:
Not containing iron.


Nonpotable:
Not suitable for drinking.


NPS:
National Pipe Straight threads standard, same as IPS.


NPS (Discharge):
Nonpoint Source pollution: nutrients, sediments, toxic substances, and pathogens that degrade waterways. NPS occurs mainly through storm water runoff.


NPSHA:
Net Positive Suction Head Available to prevent cavitation of the pump. It is defined as atmospheric pressure + gas pressure + static pressure - vapor pressure - friction loss in the suction piping.


NPSHR:
Net Positive Suction Head Required to stop a pump from cavitating. This number is usually provided by the pump manufacturer.


NPT:
National Pipe Tapered thread standard. Same as IPS.


NRDC:
Natural Resources Defense Council - A non-profit environmental advocacy organization that seeks to protect the encironment and the nations natural resources.


NSF:
National Sanitation Foundation.


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