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There are 3 entries in the glossary.| Pages: 1 |
| 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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