Doc Johnson Knuckle Up For Vac U Lock Attachments Dildo BDSM Fetish

Take your Vac-U-Lock play to a whole new level with the legendary Knuckle Up – the ultimate hands-on accessory that turns any Vac-U-Lock dildo into a fist or finger-play powerhouse!

Simply slide your fingers through the built-in knuckle rings and attach your favorite Vac-U-Lock dildo or plug to the front. Now you have total control: punch, twist, thrust, and tease with precision and power that feels incredibly real. Perfect for intense solo sessions or dominating (or submitting to) a partner.

Made from body-safe, phthalate-free materials and designed to work flawlessly with the entire Vac-U-Lock system – the most versatile and trusted strap-on and toy attachment system in the world.

Key Features

• Transforms any Vac-U-Lock dildo into a hands-on fist/finger toy

• Comfortable knuckle rings for secure grip

• Full control over depth, speed, angle and rotation

• Ideal for fisting training, BDSM impact play, and intense penetration

• Works with hundreds of Vac-U-Lock compatible dildos and plugs

• Body-safe, phthalate-free ABS plastic construction

• Easy to clean and built to last

• Instantly adds a massive “wow” factor to your play sessions

Specifications