Skip to product information
1 of 4

12 total reviews

| Over 4900 Sold!

Knuckle Up Vac-U-Lock


Knuckle Up Vac-U-Lock | accessory

Regular price $23.95
Regular price Sale price $23.95
Sale Sold out
or 4 interest-free payments of $5.98 with Simpli Pleasures - Sezzle Payment Logo

Arrives between Tue, Jul 16 and Wed, Jul 17.
Want it sooner? Select express shipping at checkout.


Couples Couples Wearable Wearable ABS Material ABS Material Beginner Beginner


Ensuring an absolutely perfect grip on your favorite Vac-U-Lock dildo, plug or probe, the Knuckle Up is completely unique, extra user friendly, and a truly great addition to the Vac-U-Lock family.

Taking the shape of classic brass knuckles, the firm ABS plastic grip fits through the fingers and provides a solid handle for ultra precise maneuvers once a compatible toy has been attached to the universal plug up top.

Simply slide your penetrator of choice on, and enjoy.

Fits most hands.

Product Video


  • Base type: Finger Loop
  • Contains phthalates: No
  • Flexibility: Firm
  • Material: ABS
  • Texture: Smooth
  • Waterproof: Submersible
    Extra Info
  • Adventure Level: Beginner
  • Who's it for: For Either Sex

Key Benefits

  • Unique and innovative alternative to the Vac-U-Lock plug harness system - compatible with all Vac-U-Lock accessories
  • Features a plug to attach all Vac-U-Lock-compatible dildos to this toy
  • Gives you better control when pleasuring your partner with your hand
  • Easy to grip and control
  • Comfortable and easy to use - great for vaginal or anal penetration play

Order Over The Phone

Talk to one of our customer care specialists and take your order over the phone. Just dial 1-833-200-9644 and reference the following product number: DJ101012

Easy Returns

With our 60 day money-back return policy you can shop worry free

View full details

The Joke's On Us

Whenever you leave a review on a product that you love, you'll get a response from one of our hilarious Simpli comedians. Read at your own risk.

Customer Reviews
3.8 Based on 12 Reviews
5 β˜…
4 β˜…
3 β˜…
2 β˜…
1 β˜…
Write a Review Ask a Question

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
30 Sep 2020
Mark M.

Separated in two pieces while in toy

I believe this is a defective Knuckle-up product and that maybe it should have been glued together but it separated in the toy. In doing so I could get the tip out of the toy's ac-U-Lock hole with a pair of needle-nose pliers but it damaged the toy (B-10 Warhead) that was just purchased on Jan 30 of this year. I would like a replacement for both the toy and the Knuckle-up both manufactured by Doc Johnson. I have never had this much bad luck with Doc Johnson toys in the past.

27 May 2021

Simpli Pleasures

Hi Mark M, Thanks for leaving a review. I am sorry to hear that your item is faulty, we will be more than happy to help. Please contact customer service so that we can start your exchange process for the toy. Kind regards, Angelica | Customer Care 1-800-918-6308

04 Sep 2020
R/E M.

Great for making double end toys

Works just like it was advertised. It’s perfect for combining two toys and having fun! The interchangeability makes it nice to come up with a good combination for your toybox. Also works well for pegging!

17 Jul 2020

Must have product

Does the job we use it for the adapter for the underwear we like to use

11 Jun 2020
Terry J.

Not very suctiony

Not very suctiony

17 May 2020


As expected

23 Apr 2020
Rowan H.

RE: Large Suction Cup Plug

So first off, let me say that the comfort level is great, and the thickness certainly helps the dildo stay nice and sturdy. I will say, however, that the I bought this in the hopes that it would work better than the standard suction cup that came with it. The suction power was okay for maybe the first couple uses, but then rapidly degraded to the point where it had no suction whatsoever. Very disappointing, especially for the price.

01 Apr 2020

broke after one use

This item is poorly designed and has a weak suction cup. The hinged portion stopped holding it in place after one use. waste of money.

27 May 2021

Simpli Pleasures

Hi Jay, Thanks for leaving a review. I am sorry to hear that your item is faulty, we will be more than happy to help. Please contact customer service so that we can start your exchange process for the toy. Kind regards, Angelica | Customer Care 1-800-918-6308

16 Nov 2019

Must have accessory for wild times

This is a great accessory to make handling large toys easier. Especially when they are lubed-up and become slippery.

06 Sep 2019

Good product

Good Value, This product would improve with smooth rounded edges for finger placement and maybe a rubberized tail grip that is a bit springy but still resistant to lube deterioration. Otherwise price point works as intended.

29 May 2019

Good vibrations!

Add a little something extra to your strap on play. This is a great addition to your vac u lock harness. Just snap this into the harness and turn all of your attachments into vibrators.