The AWWA C504 EPDM Seated Butterfly Valve shall be of concentric design and a heavy-duty valve design. The valve is lined with rubber to offer a resilient seat. The rubber seat is bonded to the valve body and is not replaceable in the field. The valve is designed for treated water, untreated water, and other neutral clean fluids. This manual will furnish you with the necessary information for the proper installation and maintenance of the valve and to guarantee a long service life。