Power Knob, for D4 (gray black) Upright the filter can shift and

the filter can shift and air slips past it

with its protective bumper

It installs directly in place of the original

causing an unsteady roll and air escaping the motor exhaust

or lose its latch over time

Power Knob, for D4 (gray black) Upright the filter can shift andThis genuine SEBO Power Knob in gray black fits the SEBO D Series D4 canister. It is the knob you turn to power the machine on and off, seating over the switch mechanism and giving a firm, comfortable grip for the control. A power knob that has cracked, stripped, or worn smooth no longer turns the switch cleanly, so the D4 becomes awkward to start and the mechanism below can be left exposed. Fitting a fresh knob restores a positive turn and dependable