The 975XLU Reduced Pressure Principle Backflow Assembly, with union ball valves, is used in high health hazard, potable water applications for protection against both backsiphonage and backpressure of contaminated water into the non-potable water supply. The wye pattern, bronze body is assembled with union ball valve shutoffs for easy body removal from the line, ideal for irrigation applications which require the removal of the valve during winter months. The 975XLU is the simplest, best, and most reliable backflow preventer in the irrigation market today.