The new cover RX (cover prescription) is compatible with virtually any Above-Ground spa on the market today. The unique under mount installation plate allows the RX to be installed on whatever side of your spa you choose & requires only 18" of clearance. Whether your spa is square, rectangular, octagonal, or round the cover RX will be a perfect fit & requires no drilling into your spa cabinet. Your spa cover is supported entirely by the RX & does not place any unwanted stress on the center cover seam which translates to a longer cover life. The cover RX can be operated by a single user from any position you choose; from the side of the spa, from the back, or even inside of the spa. There has never before been a more Complete spa cover lift.