The Zurn Wilkins 950XL3BFSS Double Check Backflow Assembly provides low hazard protection against backsiphonage and backpressure in potable water applications. The valve features slow closing resilient seated UL/FM approved butterfly shutoffs and supervisory switches. The 950XL3 series offers the most compact and lightest bronze small backflow available on the market today. The design combines the robust time-tested construction of our 950XL/XL2 series with the innovative modular check EZSWAP® design of our 350 series allowing for ease of repair and greater labor savings compared to all other brands.