Vac-U-Lock Double Dong Plug Attachment by Doc Johnson

The Vac-U-Lock Double Dong Plug Attachment by Doc Johnson is a dual-ended anal attachment that locks into any Vac-U-Lock harness to enable simultaneous two-way penetration for couples. At 5.7 inches long with a 1.10 inch diameter, it turns a standard harness into a hands-free tool for shared stimulation. Both partners experience penetration at the same time.

What it is

The Vac-U-Lock Double Dong Plug Attachment by Doc Johnson is a harness-mounted dual penetration tool designed for couples seeking synchronized stimulation. One end sits inside the wearer whilst the other extends outward for their partner, creating simultaneous penetration from a single attachment. The Vac-U-Lock vacuum suction system locks it firmly in place so it will not slip or shift during use. Unlike standalone anal sex toys, this attachment transforms your existing harness into a hands-free instrument for paired pleasure.

Doc Johnson has manufactured sexual health products since 1976, and this attachment reflects that build quality. The 1.10 inch diameter sits between narrow and substantial, made to provide noticeable fullness without overwhelming sensation. The attachment is fully compatible with any Vac-U-Lock harness system, meaning you do not need to purchase a new harness to use it.

What it does well

• Simultaneous penetration: Both partners feel and experience stimulation at the same moment, building shared intensity rather than taking turns.
• Secure locking mechanism: The Vac-U-Lock vacuum seal holds the attachment firmly in place throughout a session, eliminating repositioning or slippage.
• Universal harness fit: Works with every Vac-U-Lock harness on the market, so you can add dual stimulation to your existing equipment.
• Comfortable girth: The 1.10 inch diameter provides satisfying stretch and presence without overwhelming beginners or those preferring gentler sensations.
• Hands-free operation: Once locked in, the attachment stays in place, freeing both partners to focus on movement and sensation.

Specifications

• Total length: 5.7 inches (approximately 145 millimetres).
• Diameter: 1.10 inches (approximately 28 millimetres).
• Material: Body-safe composition, manufactured to Doc Johnson quality standards.
• Closure system: Vac-U-Lock vacuum suction plug; fits all Vac-U-Lock harness attachments.
• Weight: Lightweight, minimal impact on harness wear and comfort.
• Box contents: Attachment only; harness sold separately.

How to use an anal toy step by step

Start by selecting a compatible Vac-U-Lock harness and ensure it fits securely on the wearer. Apply water-based lubricant generously to the attachment and to the receiving partner's anus; warm-up with smaller stimulation first if new to anal play. Press the attachment firmly into the Vac-U-Lock port on the harness until you hear or feel a click, confirming the vacuum seal is locked. Have the receiving partner relax and guide the insertion end in slowly. Once both partners are comfortable, the wearer can begin controlled movement.

Communication is essential throughout. Check in frequently about comfort, depth, and pace, since Prostate Beads and similar products teach us that anal play requires consistent feedback and adjustment. Start slowly and increase pace only as comfort allows. After use, opens up the attachment by gently twisting and pulling away from the harness, then clean both the attachment and harness thoroughly with warm water and mild soap.

Who should buy it

Care and storage

Wash the attachment after each use with warm water and mild soap, paying attention to any textured areas where fluid can collect. Pat dry with a clean towel and store in a cool, dry place away from direct sunlight. Keep it separate from other toys to avoid material contact. The Vac-U-Lock system itself requires no special maintenance; simply ensure the vacuum port on your harness stays clean and dry between uses.

Background reading

Dual penetration and partnered anal play are common in long-term relationships seeking new ways to connect physically. Understanding anatomy, pacing, and the role of relaxation transforms the experience from uncomfortable to genuinely pleasurable. Read our detailed Anal Sex Toys Guide to learn how attachment choice, sizing, and technique affect comfort and satisfaction.

What to expect

First-time users often underestimate how much lubricant they need; the attachment should glide in easily without friction or strain. The initial insertion sensation is typically more noticeable than ongoing use, so taking time with the warm-up phase pays dividends. Many couples report that the synchronised movement creates a different kind of intensity than either partner experiences alone.

The Vac-U-Lock system is genuinely reliable—the vacuum seal keeps the attachment locked firmly throughout even vigorous movement. Most users trust it enough after the first use that they stop worrying about slippage and can focus entirely on sensation and connection.

Cleanup is straightforward. The attachment is easy to wash and dries quickly. The harness itself requires only basic wiping down, since the attachment does the bulk of fluid contact. Storage is simple if you have a dedicated drawer or pouch for your harness system.

People who return or abandon dual penetration toys usually cite discomfort rather than mechanical failure. This attachment works as designed, but success depends on relaxation, communication, and appropriate sizing for both partners. Those who take time with preparation tend to keep using it regularly.

How it compares

Why it earns its place

Shop the Vac-U-Lock Double Dong Plug Attachment by Doc Johnson from Malechastity.com.au with discreet Australia-wide delivery. This attachment turns your existing harness into a dual-stimulation tool without requiring a second purchase, and the vacuum lock mechanism eliminates the slippage and repositioning that plague free-standing double penetration toys. If you already have a Vac-U-Lock system, adding this attachment is the most straightforward way to explore simultaneous penetration with your partner. Order it now. Service That Keeps Customers Coming Back.