3/4 in. FNPT Inlet and Outlet Lead-Free Dual Check ValveThe Zurn Wilkins Model 700XL dual check is an economical way of providing backflow protection against backpressure and back siphonage in low hazard applications. The 700XL's tubular design houses two in line checks and is available in several end connection configurations. Ideal for use where lead free valves are required. California residents see Prop 65 WARNINGS Dual check valve backflow preventer consisting of two independently operated in line