has to be the generic Douglas made power nozzle. it came with the vita vac, airways, rebuilt luxs, metropolitan, etc. you can still buy it.
why, chevron brushroll grooms very well, also has deep air vents in the front, no matter how much power the vac has it is NEVER hard to push, does not seal to the carpet. fits under sofas, bed etc due to low profile
lows, does not have a swivel neck and some of them came with out the on off switch for the brush.