Connection of the manifold pipe to the pressure control panel

The factory-fitted pipe (with cutting rings and union nuts) is inserted into the screwed inlet connection on the pressure control panel and screwed in using a standard spanner up to the point at which the screw-in force increases "significantly". No extension may be used. After this point, the screw connection is tightened by another 30° precisely. Deviations from this result in understress or overstress the connection, and thus in a loss of strength.