Used for sealing the joint of PEHD flange ends (WaterKIT) with PN10-16 flanges. Material: EPDM, Shore hardness 70 ± 5 IRHD. Reference standard SR EN 681-1 Rubber sealing gaskets. Material requirements for sealing gaskets for pipe joints used in water and sewerage applications. Part 1: Vulcanized rubber. Explanation of terms in the designation: D= external diameter of the flange end with which the flange is compatible DN= nominal diameter of the flange according to SR EN 1092-1, SR EN ISO 6708.