Vac-U-Lock Ultraskyn Strap On Harness Set by Doc Johnson

Finding the right harness dildo set that offers genuine versatility and realistic sensation can be challenging. This three-piece collection combines premium dual-density material with quick-change compatibility, giving you multiple sizes and experiences in one system.

What it is

This set brings together three realistic attachments designed for harness play, each crafted from ULTRASKYN's signature dual-density formula. The firm inner core provides structural support while the soft outer layer mimics natural texture and responsiveness. The Vac-U-Lock system lets you swap attachments in seconds, transforming your experience without removing the harness. Every piece is body-safe, phthalate-free, and temperature-responsive, warming to skin temperature during use.

What sets this collection apart is its thoughtful size progression and the included supreme harness that adjusts to fit most body types. The dual-density construction creates sensations that feel genuinely lifelike, not plastic or artificial. See the full BDSM Australia range of Realistic Dildos to explore other harness-compatible options.

Key features

• Three distinct attachments: An 8-inch realistic dong and two 7-inch cocks give you options for different moods, partners, or intensity levels.
• Dual-density ULTRASKYN: Combines a firm core with a soft, responsive outer layer that feels authentic and adapts to body temperature.
• Vac-U-Lock compatibility: Quick attachment and removal means zero downtime between transitions during your scene or play session.
• Adjustable harness: The supreme harness fits users up to 69 inches with secure, comfortable straps that stay in place during vigorous use.
• Complete care kit included: Toy cleaner, lubricant, and maintenance powder keep your set in perfect condition for years of use.

Specifications

• Dildo lengths: 8 inches (realistic dong), 7 inches (two cock attachments)
• Circumference: 5.5 inches on the 7-inch models
• Material: ULTRASKYN (hypoallergenic, phthalate-free, temperature-responsive synthetic)
• Harness fit: Adjustable straps accommodate users up to 69 inches tall
• System: Vac-U-Lock quick-change attachment with removable suction cup
• Box contents: Three dildos, supreme harness, water-based lubricant, Natural Toy Cleaner, ULTRASKYN Refresh Powder

How to use a realistic dildo

Start by selecting which attachment suits your mood or partner preference. Align the Vac-U-Lock connector on the dildo with the harness receptacle and press firmly until you hear or feel it lock into place. Adjust the harness straps for a snug, comfortable fit that won't shift during movement. Apply generous amounts of water-based lubricant to both the dildo and the receiving area. Insert slowly and communicate with your partner about depth, pace, and sensation throughout your session.

Once you're familiar with one attachment, experiment with switching between them to discover what intensities and sensations work best for you. The suction cup base allows hands-free positioning against walls or furniture for solo exploration. Many users find that pairing this set with Realistic Butts creates additional dimension and realism. Start conservatively with the smaller attachments and progress gradually as your comfort and experience grow.

Care and storage

Wash each attachment with warm water and the included Natural Toy Cleaner immediately after use. Dry completely with a soft cloth before storage. Apply ULTRASKYN Refresh Powder to maintain the material's original texture and prevent stickiness. Store the dildos separately in a cool, dry place away from direct sunlight, which can degrade the material over time. Keep the harness clean and dry as well.

Learn more

Understanding realistic dildo construction, materials, and harness systems helps you get the most from your purchase. Read more about what makes quality realistic dildos worth the investment in this detailed guide: Evolved Realistic Dildo. Knowledge of care and maintenance also extends the lifespan of your set significantly.

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 Vac-U-Lock set has become central to my control protocols. Three distinct attachments allow me to escalate intensity systematically, pushing my submissives through psychological and physical thresholds they didn't know existed. Starting with the smaller cock, I observe their responses carefully before introducing larger pieces. The dual-density material creates lifelike sensations that keep them completely focused on my commands and my presence.

What I value most is the speed of the Vac-U-Lock system. My submissives never know which attachment I'll use next—blindfolded, they experience pure anticipation. Switching between sizes mid-scene creates the unpredictability that breaks their mental walls. The harness gives me absolute positioning control, allowing me to dictate depth and pace entirely. Each piece becomes another instrument of my dominance.

Advanced scenes benefit from combining these attachments with sensory play or restraints. The realistic texture heightens their vulnerability; they're responding to something that feels genuinely human. Alternating between the 7-inch and 8-inch options creates psychological intensity beyond simple physical sensation. My most obedient submissives tremble with anticipation, never certain what comes next. That uncertainty is where true power exchange happens.

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

Grab this set when you want genuine versatility, premium construction, and the freedom to explore multiple sensations without switching equipment. The three attachments cover a full spectrum of experiences, the dual-density material feels authentic, and the Vac-U-Lock system makes transitions seamless. At BDSM Australia, you'll find everything you need to start or deepen your harness play practice. Order today and discover why this collection remains a favourite among experienced users. Australia's BDSM Specialists for Over 15 Years.