NilfiskCFM Grill and Depressor Hose. This helps to equalise pressure difference on dustbags when using the plastic dust sacks on hazardous and nuisance dust applications, and wherever the dust has to be retained in sacks for better housekeeping.
It goes between the bottom and the top hence the inside and outside of the bag, so there is no pressure difference.
At the moment, standard postage within Australia is capped at a maximum of $20! Maximise the saving on postage and buy several Puregiene toilet rolls a box of Tissues and some soap or maybe some packets of dustbags, or a hose or a new floor tool, or some other accessories!