Aqualine's Lead-Free Pressure Regulator safely prevents pressure from building in the water while also enabling it to remain high enough for daily needs. Its adjustable outlet water pressure ranges from 25 to 75 PSI. Coldwater and inlet water pressure comes in at 300 PSI. Based on a 25 PSI drop, the regulator's maximum flow capacity is between 3/4" - 30 GPM, 1" - 50 GPM, respectively. The Lead-Free Pressure Regulator from Aqualine is a plumbing safety feature designed to prevent pressure from rising too high while also ensuring the pressure remains high enough to meet daily needs. This product is meant for installation on the main water line before it enters the home.