DIN 16966-4
DIN 16966-4 Glass fibre reinforced polyester resin (UP-GF) pipe fittings an joints; Tees, Nozzles, Dimensions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1982
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/1982