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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.


Obscure Glass:
A glass that lets light through but is not totally transparent.


O.D.:
Outside Diamter - The diameter of a pipe measured from the outside edge.


OEM:
Abbreviation for Original Equipment Manufacturer.


Offset:
A tubular component which permits the offsetting of a drainage run in the same basic direction.


OHM:
A unit of electrical resistance.


Oil Powered:
A water heater that uses oil as its fuel source.


One-Handle Faucet:
Provides on/off activation and temperature setting with a single operation.


One Piece Toilet:
A toilet in which the tank and bowl are manufactured as single vitreous china fixture. Typically, one-piece toilets have a lower profile than two-piece toilets.


Open Front:
A style of toilet seat rim where there is an open space about three inches wide at the front. Considered more sanitary in commercial applications where constant usage exceeds janitorial sanitation.


Operating Cost:
The cost of running a water heater for a given time period.


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.


Organic Matter:
Plant and animal residues, or substances made by living organisms.


Orifice:
An opening through which gas is discharged and whereby the flow of gas is limited and/or controlled.


Osmosis:
The movement of water molecules through a thin membrane.


O-Ring:
Round rubber washer used to create a watertight seal.


Outlet/Discharge:
The opening through which the water exits the pump.


Outlet Sewer:
Pipe section in a septic system which runs between the septic tank and the drainage field.


Overflow Hood:
On a bath drain, the decorative hood concealing the overflow.


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.


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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