899 Sanitary (lined) Butterfly Valves for sanitary applications in Chemical and Food Processing Industries. Wafer style available in eleven sizes (from 1” to 12”) have Ductile Iron bodies lined with PTFE seat to meet a broad range of chemical compatibility requirements. Standard PTFE encapsulated 25-5 duplex SS disc & stem is twice as strong as PTFE encapsulated 316 SS. Valve body is two piece allowing for easy seat replacement and disc/stem replacement.