Ducati Diavel Workshop Manual page 575

Air intake
Pull out the filter cartridge (1) from the seat in the airbox.
Position the RH air duct (2).
Start the screws (1) and the screw (A) with washer (B).
Tighten the screws (1) to a torque of 3.5 Nm ± 10% (Sect. 3 - 3Frame torque settings) and screw (B) to a torque of 10
Nm ± 10% (Sect. 3 - 3, Frame torque settings).
Proceed in the same way to refit the LH intake duct (5), and connect the connector (C) of the air temperature sensor (4).