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scout is close. The tailpiece exits the basin and may or not contain a pop-up drain assembly. The tailpiece will connect to a part called a J-bend with slip nuts and slip washers. Yes, those washers may be plastic-I throw them away and use neoprene. The J-bend connects to a wall pipe if it is a P trap, and to a floor pipe if it is an S-trap. Piping is usually plastic DWV grade (drain waste vent), or copper in older dwellings. Nobody brazes plumbing. It is either soldered, or slip fitted.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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