Vac-U-Lock Suction Cup Plug Black strap on accessory. Let us take your pleasure to the next level. Every accessory can be used with any Vac-U-Lock compatible component. Whether you want double the pleasure, handheld control, or options for solo use Doc Johnson accessories have you covered. Vac-U-Lock is the world's first and only patented harness system, offering endless possibilities for you to embrace your fantasies. Plug features: for use with all Vac-U-Lock compatible attachments. Unique design offers total hands free control. Tabbed for easy removal. Durable construction. Total Length 3.5 Inches. Width/Diameter 2.8 Inches. Suction Cup. Material PVC.