The Heatwave Premium Cover Lift has a unique design which allows this premium cover lifter to be installed on a number of spa shapes and sizes, including square, rectangular, round & octagonal. The lift's under-mount base provides for easy installation within minutes. In addition, since it isn't screwed into flimsy spa cabinets, it can easily remove heavy spa covers without damaging your spa. The powerful gas spring makes lifting & lowering your spa cover easier than you ever imagined! The Heatwave Premium Cover Lift requires 36" of clearance in order to work effectively; will fit all spa cover widths.