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| Wash coat
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Extremely thin coating of paint, shellac, varnish, etc. which seals the surface so that the colors do not bleed through the final coat. |
| Wash primer
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Thinly applied coat of paint primer. |
| Washability
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The ability of a paint to be easily cleaned without wearing away during cleaning. |
| Washdown bowl
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Toilet with a front trap which is flushed when water flows down and around from the rim. It is a two-piece combination toilet, where the tank is separate from the bowl, with the smallest water area and the narrowest flush passage, making it the least efficient. |
| Washdown water closet
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Water closet having a siphon trapway at the front of the bowl, and integral flushing rim. |
| Washer
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Circular, small flat piece that goes under a nut or bolt head to increase the hold of the fastener or to widen the bearing surface. |
| Washing down
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Use of a solution of water and diluted muriatic acid, or other cleaning solution, to clean masonry. |
| Waste
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(1) Destruction or misuse by the individual in possession of a property causing a significant, permanent loss in value to the legal interest of another. (2) The discharge from plumbing fixtures or a term used to denote the pipes that are part of that system. |
| Waste & overflow
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Drain assembly for a bathtub. The outlet at the top removes the overflow water during tub filling and the drain at the bottom removes wastewater when the tub is drained. |
| Waste arm
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Drain extension pipe, usually to extend a sink drain into a wall. |
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