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Vac-U-Lock 8 Classic Ultra Harness with Dong by Doc Johnson

$109.99
$109.99

Vac-U-Lock 8 Classic Ultra Harness with Dong brings realistic strap-on play with an 8-inch lifelike cock and adjustable harness system. The interchangeable Vac-U-Lock technology lets couples swap attachments while maintaining secure positioning for deep penetration and hands-free thrusting control.

Key Features:

Realistic 8 inch dildo features lifelike texture with pronounced head and veined shaft for authentic penetration sensations during strap on sex with partners or solo masturbation sessions.

Ultra Harness 2 provides adjustable straps and secure fit for confident thrusting during vaginal or anal penetration without slipping or discomfort during intimate encounters.

Vac U Lock system allows quick attachment and detachment of compatible dildos using integrated powder dispenser for seamless transitions between different sizes and styles during sex.

Body safe phthalate free materials ensure safe vaginal and anal contact while realistic cock design delivers satisfying girth and length for effective G spot and prostate stimulation.

American made construction guarantees quality durability for repeated penetration sessions while comprehensive kit includes everything needed for immediate strap on sex without additional purchases required.

Vendor: Doc Johnson
SKU: STR-029-B-NOATTRIBUTES-SHOP-NONE-19680
Availability: In stock
Product type: Strap On Sextoys
Please hurry! Only 2 left in stock

An 8-inch strap-on harness with Doc Johnson's Vac-U-Lock suction system, designed for couples who want reliable hands-free penetration without slippage. The adjustable harness and textured dong deliver consistent depth and pressure for faster orgasms.

Why choose the Vac-U-Lock 8 Classic Ultra Harness with Dong
  • Vac-U-Lock suction system: Prevents wobbling or detachment during thrusting
  • 8-inch realistic dong: Deep penetration with pronounced head ridges and veined shaft
  • Adjustable harness: Fits waist sizes 28–48 inches for comfort and security
  • Body-safe PVC: Phthalate-free material that's firm yet flexible
  • Hip-transfer design: Your movement flows directly through to consistent angle and pressure
  • Machine-washable harness: Easy cleaning after use
  • Powder dispenser included: Ensures reliable suction attachment every time
📦 Discreet plain-wrapped delivery  •  💳 Private billing  •  ↩️ Easy size-swap returns

What it does

Worn around the waist and thighs, the harness holds the 8-inch dong firmly in place via the Vac-U-Lock suction system. When you thrust, your hip movement transfers directly through the attachment, creating consistent angles and steady pressure without any repositioning breaks. Pronounced ridges on the head drag against vaginal walls or press against the prostate, while textured veins along the shaft create friction that mimics natural sensations. Firm yet flexible PVC bends to hit G-spots and P-spots from multiple angles during each stroke.

Arousal builds fast because your partner receives uninterrupted penetration at a rhythm and depth you control. Consistent pressure and texture against sensitive spots causes orgasms to arrive quicker—pussy walls clench and assholes grip tighter around the shaft as friction mounts. Browse our full Strap On Me collection to explore other harness styles and attachment options.

Specifications

  • Insertable length: 8 inches
  • Diameter: 1.5 inches
  • Material: Body-safe PVC, phthalate-free
  • Harness: Adjustable nylon, fits waist 28–48 inches
  • Attachment system: Vac-U-Lock suction with powder dispenser
  • Cleaning: Machine-washable harness; toy cleaner safe dong

Fit and sizing

Measure your waist snugly over your hip bones to find the right harness size; this one fits 28–48 inches comfortably. An 8-inch dong with 1.5-inch girth suits anyone who enjoys deeper penetration and substantial fullness without overwhelming stretch. Adjust the straps around your waist and thighs until snug but not tight—comfort matters more than showing off size. Cockringshop specialises in products for men and couples, so if you're unsure whether this length or width is right for your partner, our team can help you choose the fit that works best for your body and desires.

How to use it

Adjust the harness straps around your waist and thighs until they sit snug and stable. Apply powder to the Vac-U-Lock plug and push it firmly into the harness opening until you hear the suction click. Position your partner on their back or hands and knees, then guide the head slowly inside to let them adjust to the girth. Start with shallow strokes and gradually increase depth and speed based on their moans and body language.

Focus on consistent hip angles rather than wild motion—the harness transfers your movement directly to the dong. Watch for signs like arched backs, clenched fists, or breathless gasps that tell you you're hitting the right spots. After use, wash the harness with soap and water or a toy cleaner; both are safe for the PVC dong.

Feature breakdown

Feature Specification Benefit Experience
Vac-U-Lock system Suction-based attachment with powder dispenser Prevents detachment during vigorous thrusting Confidence in harness stability
Realistic dong 8-inch PVC with pronounced head and veined shaft Mimics natural sensations with texture and drag Friction that builds arousal faster
Adjustable harness Nylon straps fit waist 28–48 inches Secure fit across different body types Comfort and security during extended use
Hip-transfer design Harness transfers wearer's movement to dong Consistent angle and pressure without breaks Steady, controlled penetration rhythm

Who it suits

Couples exploring strap-on play benefit most from this system, especially when one partner wants to give penetration while maintaining full control over rhythm and depth. Beginners appreciate the secure Vac-U-Lock attachment that prevents embarrassing slippage, while experienced users value the interchangeable system for variety. Anyone who enjoys deeper penetration and substantial fullness will find the 8-inch length and 1.5-inch girth rewarding.

Skip this if you prefer smaller sex toys or have mobility issues that make harness adjustment difficult. If your partner finds 8 inches too deep or 1.5 inches too wide, a smaller dong may be a better fit. Always communicate about size preferences before starting.

Tested and quality-checked

Every new line we stock is inspected by hand before it goes live — we check the build, the finish, and the materials, and we confirm it is safe and fit for how it will be used. Nothing is used for its intended purpose; it is examined, checked, and re-boxed. What that means for you is simple: you receive a piece we have already vetted, not a guess off a supplier's pallet. See how we test every product →

How it compares

Strap-on harnesses come in two main types: those with fixed dongs and those with interchangeable attachment systems like the Vac-U-Lock. A fixed dong is simpler and cheaper, but you're locked into one size and shape. An interchangeable system like this one lets you swap dongs to match your mood or your partner's preference—different lengths, widths, textures, and colours without buying multiple harnesses. Check out Pornhub Sextoys to see other strap-on options and attachment styles.

Please read — safety first. Put the ring on before you are fully erect and use plenty of water-based lubricant so it slides on without pinching. Keep wear time short — no more than 20 minutes while you are getting used to it, and never fall asleep wearing one. Take it off straight away if you feel numbness, coldness, a change in colour, or any pain, as these mean blood flow has been cut off too far. Never share between partners without cleaning the item first or using a fresh condom. As porous materials can harbour bacteria, use a condom over them for sharing or easy clean-up. This information is general in nature only and is not medical or professional advice, and does not take your personal circumstances into account. Stop use and speak with a qualified medical professional if you have a relevant health condition, take medication for erectile function or blood pressure, or notice pain, numbness, or discolouration that does not settle.

What you can use it with

Pair this harness with cock rings on the wearer to delay ejaculation and stay harder longer during extended sessions. Add a prostate toy or butt plug for the wearer to amplify sensation during thrusting. Couples Intimacy Kits bundle complementary items together, so both partners get pleasure at the same time—one receiving penetration while the other enjoys extra stimulation.

More from Doc Johnson

Doc Johnson makes American-made adult toys with realistic designs and innovative attachment systems. Browse Doc Johnson to find other harnesses, dongs, and Vac-U-Lock compatible pieces that pair with this system.

Read more before you buy

Not sure what to look for in a quality sex toy? Quality Sextoys has a guide to help you choose safely and confidently.

Why buy the Vac-U-Lock 8 Classic Ultra Harness with Dong by Doc Johnson

Looking for the right fit and the right material? Order the Vac-U-Lock 8 Classic Ultra Harness with Dong from The Cock Ring Store—it's genuine, function-tested, and quality-checked before dispatch. Cockringshop ships discreetly in unmarked packaging so your order arrives privately. The specialist store for rings, cages, and male enhancement — discreetly delivered. The Cock Ring Store ships discreetly Australia-wide.

Shipping Information & Policy


Cockringshop.com.au ships with Australia Post. We ship from Sydney.

All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 1-6 business days after shipping, but may subject to any postage carrier related delays beyond our control.

Free standard shipping on orders shipped within Australia above $200. For orders below $200 standard shipping within Australia is $12.95 and will be added at checkout.

Orders addressed to P.O box, G.P.O box or Parcel Collect will be handled by Australia Post. Extra time should be allocated for these orders.

Shipping Transit Times (Including Free Shipping)

Shipping time refers to the estimated time that it will take to deliver your order after it’s ready to ship (Please note this does not include time to process your order). Shipping time does not commence after your order is put through but begins the moment your order has been processed and is ready to dispatch via the our freight carrier..

1. Major City & Metro Areas (within Australia)

All in stock orders are generally processed on the same day the order was placed on business days for orders received before 12pm. Generally, orders are processed and shipped the same day or next business day.

Orders are typically received 1-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the nearest depot location.

2. Rural Areas (within Australia)

All orders are generally processed on the same day the order was placed on business days before 12pm.

Generally, orders are processed and shipped the same day or next Business day.

Packages below 2kg are usually received 3-6 business days after shipping. For larger packages please allow an extra 1-2 business days for delivery.

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from the local Australia Post depot.

International Shipping

The price for international shipping is AU$12.95 for orders equal to or below 0.399kg (399grams), and AU$22.95 for orders with a total weight equal to or above 0.4kg (400 grams).

All in-stock orders placed before 12pm AEST (Sydney Time) on business days are generally processed on the same day. Packages are usually received 6-30 business days after shipping. 

If no one is available at your delivery address to accept your order a second delivery may be scheduled or you will be notified that your order can be collected from your nearest delivery depot.

Please note in regards to all orders

– These expected delivery dates/times are based on carrier shipping practices, your destination, and the items in your order.

– Expected delivery dates are estimates. Orders can be delayed due to fraud verification or the time of the order being placed. Items that are not regularly stocked cannot be held to the expected delivery dates.

– Orders may be delivered in separate shipments.

– The order cut off times are based on normal Business Hours and exclude weekends and Holidays: Monday – Friday 12 pm

– When your order ships you will receive an email from us with a link to track your order.  If you receive your tracking number before 6 pm (AEST) it may not be updated on the Carrier’s website until that evening.

Due to large amounts of online credit card fraud, all orders are subject to approval by our payment verification department. We will notify you by phone or email should your order be delayed.

Returns Policy


We have a 14 day return policy, which means you have 14 days after receiving your item to request a refund for any defective products.

Returns and exchanges are only available for faulty items, goods not as described, or in some instances, for incorrect sizing.

Due to health and safety regulations, cockringshop.com.au cannot resell any returned or exchanged products.

This policy is in place to prioritise your well-being and ensure that you receive the highest standard of hygiene and quality in all products.

To be eligible for a refund, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging.

You’ll also need the receipt or proof of purchase. We do not issue refunds for change of mind or incorrect choice.

Under Australian Consumer Law, we are not obliged to accept returns for “incorrect choice” or “change of mind” so please choose your products carefully.

Any freight and insurance costs to return the item to us are at your expense. This includes the liability for any lost freight – send via registered post.

If your return request is accepted, we will provide you with all instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

Damages and issues

Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.

Exceptions / non-returnable items

We do not accept returns for any products that have change of mind, damaged products, or for products that have been used or do not have their original packaging.

Please get in touch if you have questions or concerns about your specific item.

Unfortunately, we cannot accept returns on sale items or gift cards.

Refunds

We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 7 business days.

Please remember it can take some time for your bank or credit card company to process and post the refund

Frequently Asked Questions

How does the Vac U Lock 8 Classic Ultra Harness with Dong provide realistic penetration sensations?
The 8 inch realistic dildo features detailed veining pronounced head and lifelike texture that mimics natural penis sensations during vaginal or anal penetration for authentic sexual experiences.
Why is the Vac U Lock 8 Classic Ultra Harness with Dong effective for couples exploring strap on sex?
Adjustable Ultra Harness 2 ensures secure positioning during thrusting while the realistic cock design delivers satisfying penetration depth and girth for both vaginal and anal stimulation.
What makes the Vac U Lock 8 Classic Ultra Harness with Dong superior for extended sexual sessions?
Body safe phthalate free construction prevents irritation during prolonged contact while the powder dispenser system enables quick dildo changes without interrupting arousal or removing the harness completely.
Which sexual positions work best with the Vac U Lock 8 Classic Ultra Harness with Dong during penetration?
Secure harness design supports missionary doggy style and riding positions while the 8 inch length provides optimal reach for G spot and prostate stimulation in various angles.
Does the Vac U Lock 8 Classic Ultra Harness with Dong accommodate different body sizes for comfortable strap on sex?
Fully adjustable straps accommodate waist sizes from petite to plus size bodies while ergonomic design distributes pressure evenly for comfortable extended wear during penetrative sexual activities.

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