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Hayward BY-series gear operated butterfly valve has a disc that is positioned in the center of the pipe and by turning the handle, the disc turns either parallel or perpendicular to the flow in varying degrees of open and closed. Body and disc are made of PVC material. Features EPDM liner, 316 stainless steel stem, fully supported bolt holes. Pressure rating 150-PSI. 316 Stainless steel lugs are also available. NSF/ANSI 61 listed. Assembled with silicone free lubricant. Measures 1-1/2-inch and 2-inch size.