O-Ring - Round rubber washer used to create a watertight seal, chiefly around valve stems.
OEM - Original Equipment Manufacturer
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.
Oil Powered - A water heater that uses oil as its fuel source.
Offset - A tubular component which permits the offsetting of a drainage run in the same basic direction.
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.
Open Front - A colorless, odorless fuel derived from the earth, consisting primarily of Methane (CH4). Odors are added to aid in leak detection.
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.
Orifice - An opening through which gas is discharged and whereby the flow of gas is limited and/or controlled.
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.
Outside Diameter / OD - The diameter of a pipe measured from the outside edge.
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.
Source: "Plumbing Terms" Standard Plumbing Supply. 11 Sept. 2008
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