Steve Walker wrote:

Blow was mainly used by us to try and shift something that was stuck in
the hose, but it was actually intended for air powered tools - such as
the spray gun that could be attached to the hose.

Yep parents had an electrolux cylinder, there was a never-used spray-gun
attachment with it that used a glass jar, but mainly the blow end was
used to eject sucked-up socks from the hose.