Watts 4-inch Backflow Repair Kit (LFRK 909-CK1 0794097) is essential for maintaining the optimal backflow prevention system functioning. Includes all components to repair a first check valve. It prevents the backflow of contaminated water into potable water. It provides clean and safe water thanks to its lead-free composition. It is an excellent choice for maintaining the reliability of your 4-inch Series 909 Reduced Pressure Zone Assembly. Order yours today and experience Watts's high-quality materials.