Vac U Lock Knuckle up Black

What the Knuckle Up Is and Who It Suits

The Vac-U-Lock Knuckle Up Black from Doc Johnson is a hand-worn base that turns your fist into a mount for any Vac-U-Lock dildo. Its grip is built for steering a Vac-U-Lock attachment with your hand alone, whether you use it solo or for a partner's session. No motor, no batteries: you supply all the motion.

Design and Material

The piece is molded from black plastic and measures 5.8 inches long, 4.5 inches wide and 0.8 inch deep. A one-size-fits-all knuckle ring grip slides over your fingers, and a standard Vac-U-Lock plug sits just above it. That layout keeps the attachment aligned with your knuckles, so every push and twist follows your hand directly.

• Fits any Vac-U-Lock attachment
• One-size-fits-all knuckle ring grip
• Phthalate-free, body-safe plastic
• Powerless and splashproof
• Made in the USA with a 90 day warranty

Compatibility

The plug follows the standard Vac-U-Lock shape, so it connects to the full range of Vac-U-Lock dildos and attachments. Swap heads in seconds and the same grip handles each one. For lube, a water-based formula works well with the plastic base and is the safe pick for most attachments, including silicone ones. If your attachment is non-silicone, a silicone-based lube is also an option. Check your attachment's material before choosing.

Application and Care

Seat the attachment firmly on the plug first, then slip your fingers through the rings. Apply lube to the attachment, not the grip, so your hold stays steady. Short, controlled strokes give the most precision. After use, detach the head and clean both parts with toy cleaner or mild soap and warm water. The base is splashproof, not submersible, so rinse it rather than soaking it, and dry it fully before storing.