Dual Union 3" CVA Check Valve SALE it provides protection and durability BSC2318 it provides protection and durability for your outdoor cooking experience The AOG Double Side Burner Cover is designed for use with T Series and L Series built in double side burners The Dual Union 3" CVA Check Valve effectively prevents backflow in ponds and water features while providing a professional pump and plumbing connection inside filters and pump vaults The heavy duty check valve flapper is built to last and maximizes water flow through the valve when open while preventing the backflow of water when the pump is shut off or during a power outage