What is the flow rate of water through 1 inch pex at 40 psi in gpm?

The flow rate of water through 1-inch PEX at 40 psi can vary based on factors like the length of the pipe and the presence of fittings or bends. However, a rough estimate for flow rate under these conditions is around 20 to 30 gallons per minute (gpm). For a more accurate measurement, one would typically refer to flow rate charts or perform calculations considering specific system characteristics.