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There are service lines and there are service lines. Since Rain Bird is in California, it might be natural for them to assume that the new water service is feeding a curbside meter pit. Other parts of the US might only have meters in basements, and that is where a service line question comes into play. Home is so far from the water main, so a service line of known length and size will figure into pressure loss calculations.
And really, who cares. Get the meter installed and make your system connection. Then do your own flow-and-pressure testing. You have a pressure gauge, a water meter, and a watch with a second hand, or stopwatch function. Some water meters now include their own flow indicators, making the testing that much easier.
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Just what is the distance the water main and the 1-inch meter? What is the pressure in the street? Is this a curbside meter or not? (these are facts you should share from the get-go, along with your location)