Vac-U-Lock
One plug, endless possibilities, that is the idea behind this clever modular system.
Vac-U-Lock: Vac-U-Lock is a modular attachment system by Doc Johnson that lets you swap dildo heads onto compatible harnesses, mounts, and handles using a universal plug and socket.
Also known as: VUL, vacuum lock system.
Vac-U-Lock works through a simple plug and socket design. The dildo or attachment has a hollow socket on its base, and the harness or handle has a matching plug that presses in and holds firm. The friction and interference fit between the plug and socket keeps everything locked in place during use. You do not need screws, straps, or extra parts to make the swap.
Because the plug size is standardised across the Doc Johnson Vac-U-Lock range, any compatible attachment fits any compatible base. That means you can use the same dildo on a harness one day and a mount or handle the next. Building a small collection of attachments and bases gives you a lot of variety without taking up much storage space. It is a budget friendly way to explore different sensations and positions over time.
Types of Vac-U-Lock
Vac-U-Lock compatible products come in several base styles, each suited to a different kind of play.
- Harness base: A O-ring style harness plate with a built in Vac-U-Lock plug, letting you use compatible dildos for strap-on play.
- Suction cup base: A plug mounted on a suction cup so you can stick a compatible dildo to smooth surfaces like tiles or a bathtub wall.
- Handlebar grip: A handheld grip with a Vac-U-Lock plug that turns any compatible dildo into an easy to hold manual toy.
- Sex machine adapter: An attachment that connects compatible dildos to thrusting sex machines, expanding what your machine can do.
- Dildo attachments: The interchangeable heads themselves, available in many shapes, sizes, and body safe materials to suit different preferences.
Curious to try? Browse our beginner friendly Vac-U-Lock toys and take your time choosing. Every HotCherry order ships discreetly. And if you want help picking, our Vac-U-Lock toys guide walks you through it step by step.
Key things to know
- The plug and socket connection is universal across the Doc Johnson Vac-U-Lock range, so attachments and bases from the same system always fit together without guesswork.
- Swapping attachments takes only seconds, which means you can change things up mid session without any fuss.
- Using one set of bases with multiple dildo heads costs less than buying separate complete toys, making it a practical choice if you like variety.
- Always check that any attachment you buy is labelled Vac-U-Lock compatible before purchasing, because other brands may look similar but not fit correctly.
- Cleaning each piece separately after use is straightforward and keeps your whole collection hygienic and ready to go.
Shop Vac-U-Lock Dildos
FAQ
Do I need to buy a special harness to use Vac-U-Lock?
You need a harness or base that has the Vac-U-Lock plug built in or included. Standard O-ring harnesses will not work with the system unless they are specifically made for Vac-U-Lock. Look for harnesses labelled as Vac-U-Lock compatible in the product description and you will be good to go.
Is the connection secure enough for vigorous use?
Yes, the friction and interference fit of the plug and socket holds the attachment firmly in place. Most users find it does not pop off during normal use. If you ever feel it loosening, just press the base back down to re-seat the plug.
What lube should I use with Vac-U-Lock attachments?
The right lube depends on the material of your attachment. For silicone attachments use a good water based lube, since silicone lube can damage silicone surfaces. For attachments made from other materials like PVC or rubber, water based lube is still a safe and comfortable choice. Note: PVC and rubber are porous materials. Unlike non porous silicone, hard plastic, or metal, they can harbour bacteria even after washing. If you choose a porous attachment, use a condom over it during use and replace it regularly.
How do I clean Vac-U-Lock pieces?
Clean each attachment and base separately after every use. Wash with warm water and a toy cleaner or mild unscented soap, paying attention to the socket and plug areas where residue can collect. Allow everything to dry fully before storing to prevent any moisture build up. Porous materials like PVC or rubber cannot be fully sterilised by washing alone; consider using a condom over porous attachments and replacing them periodically.
Can I use Vac-U-Lock attachments from other brands?
The system is designed around Doc Johnson's own plug and socket dimensions. Some third party brands do make compatible attachments, but fit and quality can vary. To be sure everything connects safely and securely, sticking with officially labelled Vac-U-Lock products is the easiest approach, especially when you are just starting out.
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