The 6455-447 and the 6455-448 has three (3) Suction Cups on the back of the pillow.
Note: The "Ball and Socket" style pillows used in all 1998 model spas have been disconinued and replaced by the suction cup style pillow. To utilize these pillows, you must install two (2) pillow pads (#6455-002) over existing Ball and Socket holes to establish a reliable sealing surface.This Pillow was used on the following 1998-2000 Models (quantity follows in (): Caprio (1), Marin® (1), Rio (1)