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The Knuckle Up is a hand-shaped accessory for Doc Johnson's Vac-U-Lock system: a standard Vac-U-Lock plug sits above one-size knuckle rings, so any Vac-U-Lock attachment can be mounted on it. It is a novelty piece for solo or partnered play rather than a standalone toy. Compared with plain Vac-U-Lock handles, it trades a simple grip for a fist-shaped form that holds attachments at knuckle level. It suits people already invested in the Vac-U-Lock line who want a different way to hold and angle their attachments.
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The Vac-U-Lock Knuckle Up is a hands-on accessory from Doc Johnson. It has knuckle rings that sit below a standard Vac-U-Lock plug.
It is compatible with the full range of Vac-U-Lock attachments. The knuckle rings are one size fits all. It can be used for solo play or with a partner.
