Made of corrosion- PVC and code approved up to 150 psi (pounds per square inch) Built-in atmospheric vacuum breaker protects household water supply from possible contamination. Gear drive flow control, double beaded diaphragm prevents leaks, and threaded bonnet for fast and easy servicing. Manual external bleed allows user to flush debris from the system. Flow control allows for precise adjustment after installation. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov For more information please visit www.toro.comCAProp65 - Diisononyl phthalate (DINP)