This super strong lever-release suction cup is specially designed to fit Main Squeeze's proprietary screw-on end cap and powerfully adheres to any smooth, non-porous surface. The Main Squeeze Suction Cup Accessory is designed for hands-free use of your Main Squeeze stroker and is ideal for shower/bath use. The strong adjustable arm swivels and bends for custom positioning, and locks into place. Includes complete instructions for use.