This super strong suction cup featuring the patented Vac-U Plug on a rotating ball joint fits any attachment in the Vac-U-Lock collection and powerfully adheres to any smooth. non-porous surface. Designed for hands-free use of all your favorite Vac-U-Lock products. this suction cup`s built-in plug swivels in any direction and angle to work every one of your hot spots from the inside. Every product in the patented Vac-U-Lock system is designed to help you create any strap-on or toy you`re in the mood for. and it`s as simple as popping on the attachment of your choice. Vac-U Plug on Suction Cup Base Swivels for Full 360° Action Use with Any Vac-U-Lock Compatible Attachment Powerfully Adheres to Any Smooth. Nonporous Surface Designed for Hands-Free Use Perfect for Shower or Bath PlayDimensions:Total Length: 4.5 in.Width/Diameter: 3.75 in.