Vac-U-Lock 8 Classic Ultra Harness With Dong By Doc Johnson

Penetrative play demands a harness that fits your body and lets you control the action. Vac-U-Lock 8 Classic Ultra Harness with Dong delivers adjustable comfort, a realistic 8-inch dong, and a quick-swap attachment system so you stay in charge.

What it is

Vac-U-Lock 8 Classic Ultra Harness with Dong is a complete penetrative kit built for control and comfort. The harness features the Ultra Harness 2 design—adjustable straps, strategic padding, and reinforced stitching—so it distributes weight evenly across your body and stays secure during extended use. The 8-inch realistic silicone dong attaches via the Vac-U-Lock system, a vacuum-seal mechanism that locks the dong firmly in place and lets you swap attachments in seconds.

What sets it apart is the precision engineering and adaptability. Body-safe silicone feels smooth and responds to your body's warmth, while the adjustable harness accommodates multiple body types without sagging or shifting. The included powder dispenser ensures a smooth connection every time. See the full BDSM Australia range of Strap-On-Me harnesses and dongs to compare other styles and sizes.

Key features

• Vac-U-Lock attachment: Vacuum-seal system locks the dong securely and allows quick swaps with other compatible attachments.
• Ultra Harness 2 design: Padded, reinforced straps distribute weight evenly for comfort during extended wear and play.
• Realistic 8-inch dong: Anatomically detailed silicone provides substantial length and girth for satisfying penetration.
• Adjustable fit: Waist strap accommodates sizes 24–54 inches, ensuring a snug fit for most bodies.
• Easy maintenance: Machine-washable harness and toy-cleaner-friendly dong simplify cleanup and storage.

Specifications

• Dong dimensions: 8 inches long, 1.5-inch diameter for realistic penetration.
• Harness sizing: Adjustable waist strap fits 24–54 inches; one-size-fits-most design.
• Material: Phthalate-free, hypoallergenic body-safe silicone throughout.
• Attachment system: Vac-U-Lock vacuum-seal with included powder dispenser for smooth connection.
• Care: Harness is machine washable; dong cleans with toy cleaner or warm soapy water.
• Contents: Ultra Harness 2, 8-inch dong, powder dispenser, instructions.
• Power: Manual operation; no batteries required.

How to use a strap on sextoy

Start by applying a small amount of powder to the Vac-U-Lock connection point on both the harness and the base of the dong. Align the dong's base with the harness socket and press firmly until you hear or feel a seal lock into place. Adjust the waist and thigh straps snugly so the harness sits stable against your body without cutting off circulation. Check that the dong hangs at the angle that feels natural for your body and your partner's positioning.

Before penetration, apply water-based lubricant generously to the dong and your partner's entry point. Start slowly, letting your partner guide the depth and pace while you control the angle and rhythm from the harness. Explore different positions—missionary, doggy style, or standing—to find what works best for you both. You can also browse Pornhub Sextoys for inspiration on positioning and technique. After play, remove the dong by gently twisting and pulling away from the harness, then clean both pieces thoroughly with toy cleaner and air-dry before storage.

Care and storage

Wash the harness in the machine on a gentle cycle or by hand with warm soapy water; air-dry completely before storage. Clean the dong with a dedicated toy cleaner or warm water and mild soap, then pat dry. Store both pieces in a cool, dry location away from direct sunlight and extreme heat, ideally in a breathable pouch or box. Inspect the harness straps and the dong for any cracks or wear before each use, and replace either piece if damage appears.

Learn more

Penetrative play opens new dimensions of connection and control for couples and BDSM practitioners alike. Understanding your body, your partner's needs, and the tools you're using builds trust and confidence. For broader insights on sexual wellness and pleasure, read How To Relieve Sexual Tension On Your Period.

Mistress Athena's training notes

By Mistress Athena — professional dominant and kink educator, sole instructor behind BDSM Australia's library of training videos. Read her full bio →

This harness gives me absolute control over submission. The adjustable fit accommodates any body I'm training, and the 8-inch dong provides the right psychological weight—substantial enough to demand respect, not so extreme that resistance becomes physical rather than mental. Watching a submissive process that first moment of penetration, seeing their breath catch and their eyes widen, tells me everything about where their limits truly lie.

The Vac-U-Lock system lets me switch attachments mid-scene, keeping my submissive perpetually uncertain. One moment they're braced for the 8-inch dong; the next, I've swapped it for something different. That unpredictability breaks down their defenses faster than any single size ever could. Power exchange isn't about overwhelming the body—it's about commanding the mind.

I've learned to use the harness angle as a tool for control. By adjusting the waist and thigh straps, I can position the dong to target specific sensations or angles that intensify vulnerability. Combined with restraint, eye contact, and breathing control, this harness becomes an instrument of psychological domination. My submissives don't just feel the penetration; they feel my presence and my will directing every sensation.

See this and similar tools in action across my 300+ training videos on the BDSM Australia channel.

How it compares

Why you'll reach for it

Find the control and comfort you've been looking for in a single kit. Vac-U-Lock 8 Classic Ultra Harness with Dong combines a realistic 8-inch dong with an adjustable, padded harness that fits your body and your vision at BDSM Australia. The quick-swap attachment system means you're never locked into one experience, and the body-safe silicone feels responsive and clean. Order today and unlock penetrative play on your terms. Quality Bondage Gear Without the Guesswork.