Vac-U-Lock vs. Grip for Motorbunny BUCK: Which Attachment System Should You Buy?

Quick answer

For the Motorbunny BUCK, the Grip system is the default and offers a secure, tool-free fit with a wide range of attachments. Vac-U-Lock is a proven alternative that opens up a vast catalog of dildos, but it requires an adapter and a bit more care. Choose Grip for simplicity and variety; choose Vac-U-Lock if you already own Vac-U-Lock toys or want specific models like the Jason Luv 10in ULTRASKYN Cock.

When you buy a Motorbunny BUCK, you get a powerful, adjustable thrusting machine. But the real fun begins when you choose what to attach. The BUCK uses a proprietary Grip system that holds attachments securely, yet many riders wonder if they can use the popular Vac-U-Lock standard. This comparison breaks down the differences so you can pick the attachment system that matches your collection and riding style.

Both systems have loyal fans. Grip is built for Motorbunny's own line of attachments, while Vac-U-Lock is a decades-old standard with a huge selection of dildos from brands like Doc Johnson. The right choice depends on what you already own, how you like to switch toys, and how much fiddling you're willing to do before a session.

How the Grip system works on the BUCK

The Motorbunny BUCK's Grip system is a spring-loaded clamp that holds attachments with a silicone or TPE base. You simply push the attachment into the Grip, and it locks in place. No tools, no threading, no adapters. This makes swapping attachments fast and easy, which is great if you like to change sensations mid-session.

Grip is compatible with all Motorbunny attachments, including the Premium Silicone "Lil' Lolli" Attachment and the "Ika" Bad Dragon Attachment. These are designed to fit perfectly, so you get a stable, wobble-free ride. The trade-off is that you're limited to Motorbunny's own catalog unless you use an adapter, and some third-party toys with round bases may not fit securely.

• Quick swap: no tools needed, just push and go.
• Secure fit: attachments are held firmly, reducing slip during intense use.
• Limited ecosystem: you'll need to stick with Motorbunny-compatible attachments or use an adapter.

How Vac-U-Lock works on the BUCK

Vac-U-Lock is a standard developed by Doc Johnson. It uses a hole in the base of the dildo and a locking plug that secures the toy. To use Vac-U-Lock attachments on the BUCK, you need a Vac-U-Lock adapter that fits into the Grip. This adapter converts the Grip to a Vac-U-Lock receiver, allowing you to use a vast array of Vac-U-Lock-compatible dildos.

The main advantage is variety. Brands like Doc Johnson offer dozens of Vac-U-Lock dildos, from the classic 8 Inch Classic Dong White to the realistic Jason Luv 10in ULTRASKYN Cock. The trade-off is that Vac-U-Lock attachments can be slightly less stable than Grip's direct fit, and you'll need to ensure the adapter is properly seated. Also, Vac-U-Lock dildos are typically made of TPE or other materials, which may require more careful cleaning.

• Huge selection: access to a wide range of Vac-U-Lock dildos from multiple brands.
• Adapter required: you'll need a separate adapter to use Vac-U-Lock on the BUCK.
• Stability: may not be as rock-solid as Grip, but with proper use, it's reliable.

Trade-offs at a glance

• Grip: simplicity vs. variety: Grip offers a quick, secure, tool-free fit, but you're limited to Motorbunny's own attachments unless you use an adapter. If you like to swap toys often, Grip is faster. Best for riders who prioritize convenience and already plan to use Motorbunny's silicone attachments.
• Vac-U-Lock: variety vs. stability: Vac-U-Lock gives you access to a massive catalog of dildos, but you need an adapter and may experience slightly less stability. The fit depends on how well you seat the adapter. Best for riders who want specific realistic dildos like the Jason Luv or already own Vac-U-Lock toys.
• Material matters: Grip attachments like the Lil' Lolli are often 100% silicone, which is non-porous and easy to sterilize. Vac-U-Lock dildos are often TPE, which is softer but more porous and requires gentler cleaning. If body-safe, non-porous materials are a priority, Grip with silicone attachments is the safer bet.

Key product facts

• Vac-U-Lock - 8 Inch Classic Dong White: This attachment is designed for use with Vac-U-Lock systems, including compatibility with Motorbunny Original and BUCK models, making it a versatile choice for your riding pleasure. If you already own or plan to buy Vac-U-Lock dildos, this classic 8-inch option shows how easily you can expand your BUCK's repertoire without investing in a whole new set.



• Jason Luv 10in ULTRASKYN Cock with Removable Vac-U-Lock Suction Cup Chocolate: Molded directly from the erect cock of porn star Jason Luv, this lifelike Ultraskyn dildo includes a removable Vac-U-Lock suction cup for hands-free fun. Total length 10 inches, insertable length 8 inches, width 2 inches. This demonstrates the realistic, high-end options Vac-U-Lock offers, but note the TPE material—it requires proper cleaning and may not be as non-porous as silicone, which is a trade-off to consider.
• Premium Silicone "Lil' Lolli" Attachment: This premium, 100% silicone attachment provides the same intense internal stimulation as the classic "Lolli" attachment, with a shorter shaft to align the bulb tip for riders with a shallower g-spot. If you prefer the Grip system, this silicone attachment is a perfect example of the body-safe, easy-to-clean options available directly from Motorbunny, without needing an adapter.

Which system fits you?

Best for

• Riders who want a quick, secure, tool-free attachment swap and prefer body-safe silicone options.
• Riders who already own Motorbunny attachments or plan to buy from the Motorbunny catalog.

Not for

• Riders who already have a collection of Vac-U-Lock dildos and want to use them on the BUCK without buying new attachments.
• Riders who want ultra-realistic dildos like the Jason Luv 10in, which are primarily available in Vac-U-Lock format.

Both Grip and Vac-U-Lock have their place. If you value simplicity, quick swaps, and non-porous silicone, stick with Grip. If you crave variety and want access to a wider range of realistic dildos, invest in a Vac-U-Lock adapter. Check your current collection and riding habits to make the right call.