Both units feature the same gear assembly. The primary differences is the motor and the Haas style unit features a 14″ tube. The Zebra Sidewinder Tube skimmer is available in various tube lengths starting at 8″ all the way up to 95″. Another slight difference is the gear assembly for the Haas unit sits on top of the metal enclosure while for the Zebra unit it is at the bottom of the metal enclosure. Other differences are listed below: Haas style differences: Larger enclosure Clear collection tray included Included 25″ extension cord Standard 14″ tube, not expandable 7 rpm motor for the Haas style