This extremely powerful suction cup features the patented Vac-U Plug on a rotating spherical axis and is compatible with any extension from the Vac-U-Lock collection. It strongly adheres to any smooth, non-porous surface. Designed for hands-free use with your favorite Vac-U-Lock products, the built-in suction cup rotates in any direction and angle, allowing you to stimulate all your hot spots from within. Each product in the patented Vac-U-Lock system is designed to help you create any strap-on or toy you desire, simply by attaching the extension of your choice.