Blind flanges are used for joining to valves or parts that connect with flanges, in water supply, sewerage, and natural gas installations. Material: carbon steel. Reference standard SR EN 10921-1 Flanges and their joints. Circular flanges for pipes, valves, fittings, and accessories, designated by PN. Part 1: Steel flanges. Explanation of terms in the designation D = nominal outside diameter of the flange adaptor end with which the flange is compatible DN = nominal diameter of the flange according to SR EN 1092-1, SR EN ISO 6708. Compatible with: PE100 flange adaptor ends PN10, item codes 44417% and 45417%. PE100 flange adaptor ends PN16, item codes 44411% and 45411%. Flat rubber gaskets, item codes 44799%. Bolt set with nut and galvanized washers, item codes 44798%.