Marketing Information899 Sanitary (lined) Butterfly Valves for sanitary applications in Chemical and Food Processing Industries. Wafer style available in eleven sizes (from 1'''' to 12'''') have 25-5 duplex SS bodies lined with PTFE, FDA EPDM, FDA Nitrile (Black or White) or fluorocarbon seats to meet a broad range of chemical compatibility requirements. Standard 25-5 duplex SS disc and stem is more corrosion resistant and twice as strong as 316 SS. Valve body is two piece allowing for easy seat replacement and disc/stem replacement.