Cast Iron Flap Valve applicable to water supply and wastewater treatment projects in various pipe and water channel as overflow, check effect, also can be applied to various vertical shaft manhole cover; Only for one-way water flow of round, square or rectangular export, the structure of ductile iron flap valve is simple, reliable work, no human operation, usable flange connection, also can connect with embedded parts fixed. Features and Benifits Unique lightweight ductile iron design Double hinge for optimal sealing Durable fusion bonded epoxy coated Anti-tamper stainless steel hinge pins Bushed hinge links Corrosion resistant construction Lifting eye as standard Drilled to suit flange and wall mounting We love hearing from our customers and value your feedback.Here are ways to contact us, 24 hours a day, 7 days a week.Email: Sales@flexible-joints.com, web: www.flexible-joints.com