Replacement end cap for Dyson DC,15 DC21 and DC23 vacuums. This part can be removed from the cleaner head to allow servicing to the agitator (brush bar). If damaged or misplaced the cleaner head will not function properly. When standing behind the vacuum this part would connect to the right side of the cleaner head. Genuine Dyson part: 909548-01 and 909548-03.