💧 Protect Your Water Supply with Confidence! ASSE Listed, IAPMO Listed, UL Classified, and more. Easy access to the first check for quick debris removal. Entire unit can be serviced without removal. Wye pattern design reduces installation time and costs. Includes backflow, pressure regulation, and strainer components. ASSE & IAPMO Listed Wye pattern design Serviceable in line The Zurn Wilkins 1-975XL 1" Reduced Pressure Principle Backflow Preventer is engineered for efficiency and reliability. Its innovative wye pattern design not only minimizes installation time and costs but also ensures easy access for maintenance. This pre-assembled unit is fully serviceable in line and comes with essential components, all while meeting rigorous certification standards.