Diameter affects water pressure. If you have a single story home and the pipes are all the same diameter then the pressure will be even throughout up until the point where the diameter changes, such as a spigot or faucet. It’s like putting your thumb on the end of a hose. .the less space you allow water to escape through, the more the pressure builds up and forces the water out faster in a stronger stream. The pressure only changes at the point of restriction.
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