Attributes . Soft SeatsPEEK (PK1)PCTFE (KF1)O-ringsEPDM (EM1)Perfluoroelastomer (FFKM) 3018 or equivalent (KZ1)NBR (NB1)Note for O-Rings - Other O-Ring materials available on request.Handles1" Round knurled (HL3)1-3/8" Phenolic (HL4) . Names