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usually supply lines are 3/4 copper off the cold and hot water supplies. when you approach the appliance the 3/4 is reduced to 1/2 inch copper AND 3/8" supply tubes on the fixtures - toilet, kitchen faucet, bathroom lavatory sinks etc. if you branch off a 1/2 inch line to a sink, there's no real volume of water so a pressure drop is negligible. heavy users like a shower may suffer however. In my house I have 3/4 inch running the length of the house both for cold and hot. where I tapped in I used 1/2 inch copper through a reducing TEE to feed whatever fixture I had. that way the volume of water was there at all times. I can run the dishwasher during fill and the sink hot water at the same time without any appreciable drop in pressure.
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