Manufacturer of Single Disc Type : Features- Single Disc check valves, Grey Iron Material - Single Disc check valves, Steel Material - Single Disc check valves, Teflon Lined Material - Single Disk check valves, Dual Plate Type : Features - Dual Plate check valves, Rubber lined Material - Dual Plate check valves, Grey Iron Material - Dual Plate check valves, Screwed End check valve