Video at the link explains it. There appears to be a rubber o-ring that holds the balloon on the rigid plastic filler tube. The weight of a filled balloon pulls itself down off the tube, and the o-ring snaps tight.
>Video at the link explains it. There appears to be a rubber o-ring that holds the balloon on the rigid plastic filler tube. The weight of a filled balloon pulls itself down off the tube, and the o-ring snaps tight.
Yeah, until someone tries to do a hundred balloons in cold weather and the o-rings fail to snap shut, with disastrous results.