Power Knob, for D4 (gray black) Upright The housing has to seal

The housing has to seal around the bag

For SEBO C Series vacuum models

the filter can shift and air slips past it

Brittle plastic and repeated filter changes are the common causes

missing sealing strip breaks that rear seal

Power Knob, for D4 (gray black) Upright The housing has to sealThis 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