Model B
Recommended for open bore options
The Model B is an advanced, 12-inch (304.8mm) long silicone colon nozzle engineered specifically for deep-fill efficiency and exceptional fluid control. Featuring a multi-stage profile with a prominent egg-shaped sealing bulb, this versatile piece can be utilized at two distinct depths: positioned near the entryway for stable rectal placement, or gently advanced past the lower sigmoid sphincter to plant the main bulb directly inside the sigmoid flexure.
Dual-Depth Sealing & Sigmoid Fluid Delivery
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Sigmoid Comfort Reach: By delivering fluid straight into the lower sigmoid colon, the Model B completely bypasses the rectum, helping eliminate sudden early urgency and premature evacuation for an easier fill.
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Primary Egg-Shaped Sealing Bulb: Features a 2.0" (50.8mm) long by 0.75" (19.0mm) diameter tapered guide tip leading into a robust 1.875" (47.6mm) maximum diameter by 2.5" (63.5mm) long bulb that anchors the piece securely in position.
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Ribbed Mid-Shaft & Secondary Rear Ball: Tapers to a 1.2" (30.5mm) mid-shaft with three 1.4" (35.6mm) modulated ribs, swelling into a 1.8" (45.7mm) rear ball that nestles inside the sphincter muscle to completely block fluid backflow.
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Base Neck & Safety Flange: Drops into a 1.0" (25.4mm) diameter base valley before finishing with a gradually tapered 2.0" (50.8mm) long by 1.9" (48.3mm) wide safety flange for exact depth control.
Dimension & Feature Specifications
| Specification / Feature | Imperial Value | Metric Value |
| Overall Length | 12.0" | 304.8mm |
| Tapered Guide Tip (Length x Diameter) | 2.0" L x 0.75" Dia | 50.8mm L x 19.0mm Dia |
| Primary Egg-Shaped Bulb (Length x Max Dia) | 2.5" L x 1.875" Max Dia | 63.5mm L x 47.6mm Max Dia |
| Ribbed Mid-Shaft (Shaft Dia / Ribs Max Dia) | 1.2" Shaft / 1.4" Ribs | 30.5mm Shaft / 35.6mm Ribs |
| Secondary Rear Ball Diameter | 1.8" | 45.7mm |
| Base Valley Neck Diameter | 1.0" | 25.4mm |
| Safety Flange Dimensions (Length x Width) | 2.0" L x 1.9" W | 50.8mm L x 48.3mm W |
👑 Bob's Choice Recommendations
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Experience Level: Advanced. Due to its full 12.0" length and substantial 1.875" bulb diameter, the Model B is recommended for experienced users comfortable with long-format appliances.
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The Prime Durometer Recommendation: For a long-format piece with these unique dual-sealing zones, Bob highly recommends selecting #10 (Medium). This softness level allows the long shaft to remain flexible enough to conform comfortably to natural pathways, while maintaining enough structural body to bypass muscle contractions smoothly.
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The Ultra-Flexible Alternative: For users seeking maximum compression, flexibility, and an incredibly compliant feel under internal muscle pressure, Bob recommends ordering in 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.