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I have a 1/2" water supply from the city. I'm redoing some plumbing fixtures in my home. Is there any reason to go with a 3/4" manifold?
You need all the help you can get. The 3/4" manifold will cause less friction loss. What is the pressure at the meter and how long is the run. These things work together to create a viable system however a larger main coming from the meter would work much better to give you volume and more pressure when you turn on your faucets.
 

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Anyone else ever seen just a 1/2" main line supply?
That just sounds wrong to me.
There would not be enough volume at any pressure.
 

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Usually main is 3/4 or 1 inch coming into house. Have seen them reduced to 1/2 inch right after water meter. Check and see. Post a pic when you can.

If thats the case, as mentioned above, you'll need all the help you can get.
 
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