Diamètre Ø : 20
4231069000, 0004207524, 81511016115, 6212188, 6212188, 1010154, 1738480, 834483
BZ6621, 4253250610, 81504106118, 81504106125, 81504106160, 81504106217, 5000560850
BS7304, 9253840502, 9253840160, 9253840010, 0074203624, 4454107730
BS8500, 9254813130, 9254813120, 9254813190, 2147775, 1424306, 1427480