• male-female configuration controls misalignment

• angular misalignment: lower of 5º or 50mm hub separation

• axial mis-alignment: hub separation equal to angular separation (above)

• radial mis-alignment: varies with hub size
- coarse mis-alignment provided by pull-in system
- fine mis-alignment provided by male/female spigot system
- radial profile to male spigot avoids snagging

• angular and radial misalignment controlled to prevent any damage to sealing surfaces during make-up