Blind flanges are utilized for joining with fittings or flanged components in water supply, sewage, 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, item codes 44417% and 45417%. PE100 PN16 Flange Ends, item codes 44411% and 45411%. Flat rubber gaskets, item codes 44799%. Set of bolts with nuts and galvanized washers, item codes 44798%.