Crowding tubs are confining areas that funnels your cattle into the cattle alley. Crowding tubs work best if the sides have a solid construction so that the cattle can only see one way out, through the alleyway. The swinging gate inside the sweep tub allows the worker to push the cattle in towards the opening of the alleyway. Sweep tubs are an essential part of working cattle. Without them it would be next to impossible to get the animals to enter the alleyway or cattle chute.