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Does anyone know where I might be able to purchase, online, a 125-GB - RainBird 1.25 inch brass valve?

As an alternative would the 1" or 1.5" Rainbird valve work with an 1.25" in/outlet pipe (assuming a reducing coupler) given a 5-10gpm flow rate? If so, would it be best to go with the 1" or 1.5"?

Thanks.