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The meter outlet at the street has a 3/4 check valve.

If i am connecting 1 inch pipe to the check or back flow valve, what are the effects on flow and pressure ?

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  • Meter for what ? What are you talking about ? "what are the effects on flow and pressure" Flow and pressure of what ? Much more info is needed.
    – Alaska Man
    Apr 3, 2020 at 21:28
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    – Ack
    Apr 3, 2020 at 23:01

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Putting in 1” will reduce pressure losses especially important with long distances from the meter to the house static pressure will not be affected . In my state 3/4 is the minimum size and 1” is recommended up to the water heater split if there is no pressure reducing valve. if You want other information, you could ask it by editing the question.

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    Tagging to add those thought: you can't do any harm AFAIK for installing the larger pipe
    – Ack
    Apr 3, 2020 at 22:33
  • the water meter outlet is one inch - the check valve is one inch going in but 3/4 going out- I will add a 3/4 to 1 inch adapter and continue on with 1 inch pipe for a 100 ft run - hopefully to increase water flow efficiency
    – DelMan
    Apr 4, 2020 at 2:25

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