Round Gasket O-ring, Teflon (TFE) Encapsulated Viton Material. Fits FSPN 0250, FSPN 250-TFE-ENC-FSP, FSPN 250-V-TFE-ENC-FSP, FSPN-250 FLANGED 2 Bag Vessel. Ultra Chemical Resistant FEP-Encapsulated Viton Rubber O-Ring. EGR30010VT EGR-30010-VT EGR-30010VT EGR30010-VT