Tunnel Fuckplug 4 Extra Large By Oxballs

Anal play at extreme scale demands a toy that matches your experience and ambition. Oxballs Tunnel Fuckplug 4 Extra Large is engineered for advanced practitioners who crave maximum penetration, unique tunnel design for electrical integration, and the psychological intensity of serious BDSM.

What it is

Oxballs Tunnel Fuckplug 4 Extra Large is a substantial anal toy built for players who have moved beyond entry-level exploration. Its 6-inch length and 2.5-inch diameter create an intense, demanding insertion that stretches the body and tests psychological limits. The plug is crafted from platinum-grade medical silicone—non-porous, hypoallergenic, and built to last through rigorous BDSM scenes. Its defining feature is the tunnel design running through the center, which allows you to integrate external electrical stimulation devices for layered sensation.

What sets this plug apart is its architecture for advanced play. The tunnel opens possibilities beyond simple insertion: you can connect TENS units, introduce temperature play, or use it as part of a broader control dynamic. See the full BDSM Australia range of Butt Plugs to compare entry-level and intermediate options alongside this extreme offering.

Key features

• Extreme dimensions: 6-inch total length with 5.5-inch insertable depth and 2.5-inch maximum diameter challenge even seasoned players.
• Tunnel construction: Central channel allows TENS unit integration and multi-sensory electrical play for advanced control dynamics.
• Medical-grade silicone: Platinum-grade material is body-safe, hypoallergenic, non-porous, and withstands thorough cleaning and repeated use.
• Waterproof design: Full waterproofing ensures easy cleaning and enables shower or water-based scenes without damage.
• Psychological intensity: Size and design demand submission and surrender, making it a powerful tool for dominance and control in BDSM practice.

Specifications

• Total length: 6 inches; insertable length 5.5 inches; maximum diameter 2.5 inches at widest point.
• Material: 100% platinum-grade medical silicone, non-porous and hypoallergenic.
• Power: No internal motor or battery; designed for external electrical stimulation device integration via tunnel channel.
• Waterproof: Fully submersible for cleaning and water play.
• Lubricant compatibility: Water-based lubricant only; silicone lubricant will degrade the material.
• Box contents: Oxballs Tunnel Fuckplug 4 Extra Large, storage bag, cleaning instructions.

How to use a butt plug

Preparation is essential with an extreme-size plug. Apply generous water-based lubricant to both the toy and your anus. Begin slowly, allowing your body time to relax and adjust to the girth. Use controlled breathing and relaxation techniques throughout insertion. Insert gradually, pausing as needed. Never force; the goal is complete accommodation and comfort before any stimulation begins. Patience at this stage determines whether your scene becomes intense or uncomfortable.

Once fully inserted, explore the tunnel's unique potential. You can connect a TENS unit for electrical sensations that layer intensity beyond the physical insertion alone. Some scenes call for wearing the plug passively, a constant reminder of submission throughout extended scenes. Others demand active engagement with movement or electrical pulses. Combining this plug with Butt Tails creates visual and tactile additions to your power exchange. Always prioritize relaxation and communication; extreme size requires trust and control.

Care and storage

Wash thoroughly with mild antibacterial soap and warm water after every use, paying special attention to the tunnel channel where bacteria can accumulate. Rinse completely and air dry on a clean towel. Store in the included storage bag in a cool, dry location away from direct sunlight or heat sources. Never use silicone-based lubricants or harsh cleaners, as these degrade the material. Inspect regularly for tears or damage before use.

Learn more

Understanding the differences between anal toys helps you choose the right tool for your goals. Read Anal Plugs Vs Prostate Massagers to explore how plugs compare to prostate-focused toys and what each offers your practice. Knowledge of anatomy and toy design deepens both pleasure and safety in advanced BDSM scenes.

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 →

Size alone doesn't break a submissive—control does. This plug's extreme dimensions demand complete surrender, but my technique is what transforms that physical challenge into psychological collapse. I watch carefully as they struggle to accommodate the girth, breathing through each inch of insertion. Their eyes tell me everything: resistance melting into acceptance, fear becoming trust.

The tunnel design is my secret weapon. Once fully seated, I connect my TENS unit and send waves of electrical sensation directly through their core. Combining physical stretch with electrical intensity creates an overwhelming sensory storm they cannot escape. Some submissives weep; others simply tremble in complete submission. The psychological impact exceeds the physical sensation—they know I control every aspect of their experience.

Timing matters enormously. Wearing the plug for extended periods during a scene creates a different dynamic than intense, short bursts of stimulation. I've had submissives wear it for hours under clothing, a secret between us, their awareness of it sharpening their obedience throughout the day. The anticipation of what comes next—whether electrical play, movement, or simply removal—keeps their mind focused entirely on submission.

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

Score the ultimate anal experience when you're ready to push beyond your perceived limits. Oxballs Tunnel Fuckplug 4 Extra Large delivers unmatched intensity and control potential for serious BDSM practitioners. The tunnel design opens electrical play possibilities no standard plug offers. At BDSM Australia, you'll find everything needed to build your scene—from electrical devices to complementary toys. Order now and transform your practice into something extraordinary. Quality Bondage Gear Without the Guesswork.