Blind flanges are used for joining with fittings 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 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. Compatible with: PE100 PN10 flange ends, article codes 44417% and 45417%. Flat rubber gaskets, article codes 44799%. Bolt sets with nuts and galvanized washers, article codes 44798%.