Vac-U-Lock

Vac-U-Lock by Doc Johnson solved a problem that every strap-on user understands: wanting variety without buying an entire new harness setup each time. Their patented plug-and-play system uses a universal locking mechanism that connects any Vac-U-Lock attachment to any Vac-U-Lock harness or base. Buy the harness once, then swap between dozens of different dildos, plugs, and attachments in seconds. It's the LEGO of the adult toy world, and after decades on the market, it remains the gold standard for interchangeable systems.

The Vac-U-Lock system consists of harnesses (including strap-on styles and suction cup mounts), and a wide range of interchangeable attachments. Attachments include realistic dildos in various sizes and skin tones, fantasy designs, vibrating options, double-ended designs for wearer stimulation, and slim-to-large sizing for progressive experiences. Every attachment features the universal Vac-U-Lock plug on its base that clicks securely into any compatible harness.

The system approach transforms the economics and practicality of strap-on play. Instead of buying a complete new harness-and-dildo combination every time you want a different size, shape, or style, you invest in one quality harness and then expand your collection with individual attachments. Mid-session swaps take seconds. Partners can alternate between sizes or styles without interrupting the flow. And the secure locking mechanism means the attachment stays exactly where you put it during use.

Vac-U-Lock attachments are made from Doc Johnson's body-safe materials including their ULTRASKYN and Dual Density ranges. Clean attachments with warm water and toy cleaner after every use, paying attention to the locking plug area where lubricant can collect. Harnesses should be washed according to their material type. The locking mechanism itself requires no special maintenance beyond keeping it clean and dry.

Vac-U-Lock is for couples who enjoy strap-on play and want variety without repetitive expense. Partners who want to experiment with different sizes and styles. People who enjoy pegging and want a reliable, secure system. And anyone who appreciates the practical elegance of a modular system that grows with their interests rather than requiring wholesale replacement every time preferences change.

Start with a Vac-U-Lock harness and one or two attachments that match your current preferences. As you explore, add new attachments to expand your options. The beauty of the system is that every new attachment you add multiplies the possibilities without requiring new hardware. Browse our Vac-U-Lock range in dildos and strap-ons and harnesses.

The initial investment in a Vac-U-Lock harness is comparable to any quality strap-on. Where the system saves money is over time: individual attachments cost significantly less than complete harness-and-dildo sets, and the universal compatibility means your first harness works with every attachment you'll ever buy. The longer you use the system, the better the value proposition becomes.