Understanding Water Pressure Regulators and Why You Need One Completing a water pressure regulator valve installation is the single best way to protect your home's pipes and appliances from high-pressure water damage. Quick Guide: How to Install a Water Pressure Regulator Test the Pressure: Screw a manual pressure gauge onto an outdoor hose spigot. If the reading is over 80 PSI, you need a regulator. Shut Off the Water: Close your home's main water shut-off valve and open a l