DIN 8914
DIN 8914 90° tapered seal rings and caps for use with PN 40 flared flange solderless compression couplings in refrigerating systems
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/1990
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 06/01/1990