... Seal: PTFE/ Double-sided O-ring. Valve Seat Seal: Valve Core with EPD ring Valve Cover Bolt: Cauterize-plated steel-made Digital ... EN558-1 standard Marker: ELEX, PN,, DN, Direction Arrowhead, Material and Cast Date(Day,Month,Year, ) Valve Marker: ELEX, Grade 150, Size ... EN558-1 standard Marker: ELEX, PN,, DN, Direction Arrowhead, Material and Cast Date(Day,Month,Year, ) Valve Marker: ELEX, Grade 150, ...