Used for sealing HDPE flange end connections (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 designation: D = outer 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.