DIN 86066
DIN 86066 Cast steel welding elbows for storm valves - DN 50 to DN 150, flangeconnecting dimensions according to PN 10
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2014