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O-Ring - Round rubber washer used to create a watertight seal, chiefly around valve stems.
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.
Outlet Sewer - Pipe section in a septic system which runs between the septic tank and the drainage field.
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