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TERM
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EXPLANATION
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O-Ring |
Round rubber washer used to create a watertight
seal, chiefly around valve stems. |
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OD |
Outside
Diameter |
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OEM |
Original Equipment Manufacturer. |
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Oakum |
Loosely woven hemp rope that has been treated
with oil or other waterproofing agent; it is used to caulk joints in a
bell and spigot pipe and fittings. |
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Oil Powered |
A water heater that uses oil as its fuel source.
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One-Piece Toilet |
A toilet in which the tank and bowl are manufactured
as a single vitreous china fixture. One-piece toilets usually have a lower
profile than two-piece toilets. |
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Operating Cost |
The cost of running a water heater for a given
time period. |
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Orbital Weld |
A circumferential, full fusion weld used to
join together two lengths of tubing. It is a GTAW welding process. Usually
to join coiled lengths. |
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Organic Matter |
Plant and animal residues, or substances made
by living organisms. |
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Orifice |
An opening through which gas is discharged
and whereby the flow of gas is limited and/or controlled. |
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Outlet / Discharge |
The opening through which the water exits
the pump. |
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Outlet Sewer |
Pipe section in a septic system which runs
between the septic tank and the drainage field. |
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Outside
Diameter |
The diameter of a pipe measured from the outside
edge. (OD) |
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Overflow hood On a bath drain, the decorative
hood concealing the overflow. |
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Overflow Tube |
The vertical tube inside a toilet tank that
directs water into the bowl in case the ballcock malfunctions. It is usually
part of the flush valve. It prevents potential water damage caused by
a tank overflow. A "constant-running" condition alerts the user to a problem.
On most toilets, the overflow tube also has a refill tube flowing into
it, which directs water from the ballcock through the overflow tube to
the bowl, after a siphon break. |
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Ozone |
An unstable form of oxygen (O3
), which can be generated by an electrical discharge through air or regular
oxygen. It is a strong oxidizing agent and has been used in water conditioning
as a disinfectant. |
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