Crane Valves” Duo-Chek II high-performance wafer check valve is designed to solve non-return valve problems by allowing the same flow-through as an equivalent-sized swing check. The valve is available in classes 125-2500 and sizes from two inches to 72 inches. Lug, wafer, double-flanged, retainerless, and extended body styles are available. Raised-face, plain-face, ring-joint, weld-end, and hub-end options are also available. The valve features resilient seal materials. Materials of construction include cast iron, ductile iron, WCB cast steel, 316 stainless steel, and all alloys.