Doc Johnson's Vac-U-Lock system revolutionises harness attachments with its patented design centered around the Vac-U-Lock Plug. When an attachment is affixed to the plug, air is expelled from the hollow, creating a vacuum-like seal that securely locks the attachment in place. First introduced two decades ago, Vac-U-Lock remains the premier brand in harness systems, offering unparalleled strength and reliability. With an extensive range of attachments, plugs, and complete harness systems, Vac-U-Lock presents a versatile modular sex system. Users have the flexibility to mix and match attachments, harnesses, and plugs, unlocking endless possibilities for customised pleasure.