Diamètre Ø : 20
BS3404, BS3417, 4235050000, 4235050010, 81511016378, 1932639, 0203277400
K2B1029, K2B0528XU, 9254310950, 9253213410, 1606835, 1629515, 1731941
O 302
BS7304, 9253840160, 9253840010, 0074203624, 4454107730, 6609441