Hydrotek HB8CRFKC-1.28DF Automatic Dual-Flush Closet Retrofit Kit (1.28 / 1.0 GPF)

The Hydrotek HB8CRFKC-1.28DF is an advanced, battery-powered concealed retrofit solution designed to upgrade manual flushometers to high-efficiency, touchless dual-flush operation. Specifically engineered for concealed (behind-the-wall) installations, this kit is compatible with industry-standard Sloan Royal/Sloan and Zurn Z9000 series valve bodies. By combining a 1.28 GPF full flush for solids with a 1.0 GPF reduced flush for liquids, this system enables facilities to achieve superior water savings while meeting stringent High-Efficiency Toilet (HET) standards and LEED requirements.

Professional-Grade Engineering & Retrofit Compatibility

• Optimized Concealed Design: Specifically built for behind-the-wall applications, ensuring a streamlined, vandal-resistant restroom environment while providing the benefits of modern automation.
• Universal Valve Integration: Precision-engineered to fit existing Sloan and Zurn concealed closet valve bodies, allowing for a seamless transition to touchless technology without replacing the entire valve.
• Superior Piston Technology: Unlike traditional diaphragm kits, Hydrotek’s piston-operated mechanism provides consistent flush volumes and is highly resistant to mineral buildup and fluctuating water pressures.
• Durable Chemical-Resistant Seals: Equipped with industrial-grade VSI silicone elastomer seals that resist degradation from chlorine and other harsh water treatment chemicals for long-term, leak-free performance.

Advanced Dual-Flush Intelligence

• Smart Occupancy Sensing: The sophisticated infrared sensor automatically differentiates between user durations. Short stays trigger a water-saving 1.0 GPF flush, while longer durations trigger a full 1.28 GPF flush, maximizing efficiency at every use.
• Battery-Powered Independence: Operates on four (4) standard AA alkaline batteries, eliminating the need for complex and costly electrical wiring. The low-power circuitry is optimized for long-term reliability in high-traffic settings.
• Touchless ADA Compliance: Provides a fully sanitary, "no-hands" experience that reduces cross-contamination and ensures full compliance with ADA accessibility guidelines.
• Integrated Self-Diagnostics: Features an electronic system with built-in self-diagnostics and a manual reset button to simplify maintenance and ensure peak operational performance.
• Automated Hygiene Flush: Includes a programmable 24-hour sentinel flush to maintain the trap seal and prevent the accumulation of sewer gases during periods of low usage.

Technical Specifications & Installation

• Application: Concealed (behind-the-wall) water closet retrofit.
• Flush Volumes: High-efficiency dual-flush 1.28 GPF (full) / 1.0 GPF (reduced).
• Pressure Range: Engineered for reliable performance between 10–125 PSI.
• Simplified Maintenance: The concealed kit design allows for easy access behind the wall, reducing restroom downtime during service or battery replacement.

Shop at ProDryers: Upgrade your facility's concealed plumbing to the highest standard of water efficiency and touchless hygiene. Buy the Hydrotek HB8CRFKC-1.28DF at ProDryers to secure the best market pricing, or request a best price quote for your next high-efficiency commercial retrofit or LEED-certified project today.

Download the Spec Sheet