Knuckle

The Knuckle is an enhanced, highly contoured rib-style colon nozzle for users who want an intensely stimulating, high-sensation experience. The progressively larger diameters of the integrated ribs and valleys are designed to form a firm, highly effective hydraulic seal against the anorectal sphincter muscle. This innovative undulating texture naturally diminishes fluid leakage during enema solution delivery while providing variable, step-based lengths of insertion for customized personal comfort.

Advanced Dual-Groove Engineering: The main nozzle section following the tip features five distinct sets of "knuckles" (enhanced ribs) paired with five matching valleys. To maximize stimulation and internal sealing, each primary rib segment is uniquely split by a smaller secondary groove in the center. This hybrid design delivers a completely unique sensation, allowing the Knuckle to function perfectly as both a highly tactile colon nozzle and a short, highly texturized colon tube.

Anatomical Design & Dimensions:

• Overall Length: 10.5” total length.

• Insertable Depth: Provides approximately 10.0” of fully usable insertion depth to the flared base.

• Ball Tip Section: Starts with a smooth 0.9” (22.8mm / 68.5 French) ball tip, followed immediately by a 0.8” (20.3mm / 61 French) drainage groove.

• 1st Knuckle Segment: Rises to a 1.2” (30.5mm / 91.5 French) peak before stepping to a 0.95” (24mm / 72 French) valley.

• 2nd Knuckle Segment: Expands to a 1.3” (33mm / 99 French) peak with a 0.9” (22.8mm / 68.5 French) valley.

• 3rd Knuckle Segment: Reaches a 1.4” (35.5mm / 106.5 French) peak with a 1.1” (28mm / 84 French) valley.

• 4th Knuckle Segment: Swells up to a prominent 1.45” (36.8mm / 110 French) maximum peak.

• Final Flared Rib: A large, intense 1.8” (45.72mm / 137 French) final retention ring to maximize expansion.

• Sphincter Retention Valley: Drops down to an approximate 1.2'' diameter neck nestled right against the flared safety base.

👑 Bob's Choice Recommendations

• Experience Level: Intermediate. Designed for those who favor pronounced, stepping textures and robust internal retention over entirely smooth profiles.

• The Prime Durometer Recommendation: For a texturized nozzle with this many detailed, closely spaced ridges, Bob highly recommends ordering in #10. This material density ensures that each of the five knuckle ridges and sub-grooves maintains its crisp, stimulating structural shape perfectly during insertion, preventing the ridges from compressing flat under muscle tension while still offering excellent flexibility.

• The Maximum Compliance Alternative: If you want these pronounced knuckles to feel softer, and transition smoothly past internal contours with minimal resistance, Bob suggests selecting our extra-soft #00-50 composition.

Color Options: #18 and #30 are available in pure translucent. #00-20, #00-50, and #10 base colors are translucent white and can be mixed with any standard color.

Important Safety Disclaimer: Because individual anatomy varies, we cannot guarantee a full fit for all longer or larger diameter pieces. Please use all products with care. By purchasing, you accept full responsibility for safe use. If you experience discomfort, discontinue use immediately.