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Originally Posted by kazoo
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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It could be really old and be lead, in which case it is soldered as well.
My place had all cast iron drains which was great stuff, but I had to take it all out to redo my bathroom. Replaced with ABS, which fine and dandy, but noisy.
Nothing is as quiet as cast iron.