Doc Johnson Vac-U-Lock universal strap-on plug with modular attachment system for harness play
Key Features:
Universal dildo attachment system
60-inch adjustable nylon strap
Ergonomically curved base design
Quick-change Vac-U-Lock mechanism
Accommodates multiple body types
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Finding a harness that fits your body and lets you switch toys mid-scene is rare. This universal strap-on plug solves both problems with a 60-inch adjustable nylon strap and Vac-U-Lock compatibility, so you can change attachments instantly without removing the harness.
This universal strap-on plug is a harness system built for flexibility and comfort. Doc Johnson engineered it around the Vac-U-Lock mechanism, a proprietary attachment system that lets you clip different dildos onto the base without unbuckling the strap. The 60-inch adjustable nylon strap wraps around your waist and secures with a buckle, fitting bodies from 24 to 54 inches around. A curved, padded base sits against your body and prevents chafing during longer scenes.
What sets this harness apart is speed and adaptability. You can switch between three different dildos in seconds, keeping your partner guessing or responding to what they need in the moment. See the full BDSM Australia range of Strap-On-Me compatible harnesses and attachments.
Start by adjusting the nylon strap to your waist size. Wrap it around your body and secure the buckle so it fits snugly but comfortably—you should be able to fit one finger under the strap. Align your chosen Vac-U-Lock dildo with the curved base and press firmly until you hear or feel it click into place. Position the padded base against your body for maximum comfort and check that the attachment is secure before beginning.
During play, you can switch dildos by pressing the release button and removing the current attachment, then clicking a new one into place. This works mid-scene without interrupting momentum or requiring you to remove the harness. Explore different positions—waist, thigh, or even chest mounting—to discover what works best for your body and your partner's. Check out the Sensuva On collection for compatible attachments that expand your options.
Wash the nylon strap and padded base with mild antibacterial soap and warm water after each use. Air dry completely before storing to prevent mildew. Keep it in the included storage bag away from direct sunlight and heat. Check the stitching and attachment points regularly for signs of wear, and replace the harness if seams split or the base cracks.
Understanding harness fit and toy compatibility helps you get the most from this system. Read more about preparation and technique in our guide, An Educational Primer On Pet Play. Proper maintenance also extends the life of your gear and keeps it safe for repeated use.
This Vac-U-Lock plug has become essential in my sessions. Its adaptability lets me maintain control while keeping my submissive uncertain—I can switch attachments mid-scene without breaking rhythm, forcing them to stay present and attentive. The quick-release mechanism means I never lose momentum, and that unpredictability deepens their focus on my commands.
My most effective technique involves gradually increasing attachment size as the scene progresses. I observe their response carefully, using the universal system to push boundaries at precisely the right pace. Sometimes I'll tease with a smaller dildo, then switch to something more challenging. This keeps them psychologically off-balance while building intensity.
The curved, padded base matters more than most users realize. Comfort during extended scenes allows me to maintain control longer, and a submissive who isn't distracted by discomfort is a submissive fully focused on their service. The adjustable strap fits all my regular partners, so I don't need multiple harnesses for different body types.
See this and similar tools in action across my 300+ training videos on the BDSM Australia channel.
| Feature | Vac-U-Lock Universal Strap-On Plug | Standard Fixed Harness | Leather Bondage Harness |
|---|---|---|---|
| Toy attachment | Quick Vac-U-Lock system, swap in seconds | Single dildo glued or bolted in place | Rings or pockets for various sizes |
| Material | Nylon webbing and synthetic base | Silicone or TPE | Leather with metal hardware |
| Fit range | 24 to 54-inch waist, fully adjustable | Fixed sizes, limited customization | Adjustable but bulkier |
| Best for | Quick scene changes and versatility | Single-toy consistency | Aesthetic power exchange and durability |
Browse the Vac-U-Lock Universal Strap-On Plug at BDSM Australia when you want a harness that adapts to your body and your scene. This system gives you the freedom to switch toys without losing control or comfort, making it ideal for partners who want variety and responsiveness in their play. Order today and discover how quick-change versatility transforms your intimate moments. Australia's BDSM Specialists for Over 15 Years.
BDSM Australia 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.
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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.
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Refunds
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