... /C515, DIN3202 F4/F5, MSS SP-70.3. End Flange Connection: ANSI B 16.1, BS EN 1092 ... Table E4. Disc: Grey iron, Ductile iron, with or without EPDM5. Seat: Stainless steel, Brass/Bronze etc6. Testing: API 598, ISO ... Ductile iron, Carbon steel, Stainless steelDisc Grey iron, Ductile iron, Carbon steel, Stainless steel, with or without EPDMSeatEPDM / NBR / VITON / PTFEStemStainless steel, Brass/Bronze etc ...