Hydrotek HB8-R128D Automatic Flush Valve Retrofit Kit (1.28 GPF Closet)

The Hydrotek HB8-R128D is a premium, sensor-activated retrofit kit specifically engineered to convert manual Delany closet flush valves into high-efficiency, touchless systems. This industrial-grade solution allows facility managers to upgrade their existing plumbing infrastructure to modern hygiene and ADA accessibility standards without the cost of a full valve replacement. Providing a consistent 1.28 GPF (4.8 LPF) flush, this kit is the definitive choice for facilities looking to achieve water conservation goals and reduce maintenance overhead in high-traffic commercial environments.

Professional-Grade Engineering & Seamless Integration

• Specialized Delany Compatibility: The "D" designation indicates that this retrofit kit is precision-engineered for seamless integration with Delany brand manual closet flush valves. This ensures a perfect mechanical fit and maintains the structural integrity of the existing valve body while introducing advanced electronic control.
• Touchless ADA Compliance: By replacing the manual handle with an infrared sensor, this kit provides a 100% hands-free experience. This fulfills ADA accessibility requirements and significantly improves facility hygiene by eliminating one of the most common touchpoints in the restroom, reducing the risk of cross-contamination.
• Industrial Piston Reliability: Hydrotek’s proprietary piston technology provides a significant performance advantage over traditional diaphragm systems. The piston mechanism is highly resistant to mineral deposits and waterborne debris, ensuring a precise 1.28 GPF flush volume even in buildings with fluctuating water pressure or older piping systems.
• Corrosion-Resistant Construction: Featuring a high-quality brass sensor housing with a durable chrome finish and industrial-grade VSI silicone elastomer seals, the HB8-R128D is built to withstand the rigorous demands of high-traffic commercial environments and exposure to treated municipal water.

Advanced Sensor & Battery Features

• High-Efficiency Water Savings: Operating at 1.28 GPF, this retrofit kit meets the standards for High-Efficiency Toilets (HET), helping facilities reduce water consumption by 20% compared to standard 1.6 GPF models.
• Battery-Powered Simplicity: Powered by four (4) standard AA alkaline batteries, this retrofit kit requires no electrical hardwiring. This makes it an ideal solution for upgrading older facilities where running power to each stall would be cost-prohibitive.
• True Mechanical Manual Override: Unlike many electronic valves that become inoperable when batteries fail, the HB8-R128D features a standard manual-mechanical override button. This ensures the closet remains fully operational for users at all times, preventing out-of-order fixtures during battery maintenance cycles.
• Automated Hygiene (Sentinel) Flush: The integrated electronics include a built-in 24-hour sentinel flush feature. If the fixture is not used for a 24-hour period, the system automatically activates a flush to maintain the trap seal and prevent sewer gases from entering the facility.
• Smart Self-Diagnostics: The system includes sophisticated self-diagnostic logic and a manual reset function, allowing maintenance staff to quickly identify and resolve performance issues, minimizing restroom downtime.

Technical Specifications & Performance

• Application: Retrofit Kit for manual Delany Closet Valves.
• Fixture Type: Closet (Toilet).
• Flush Volume: High-Efficiency 1.28 GPF (4.8 LPF).
• Power Source: 4 x AA Alkaline Batteries.
• Operating Pressure: Reliable performance across a pressure range of 10–125 PSI.

Shop at ProDryers: Upgrade your existing Delany fixtures with the ultimate in sensor-activated reliability and water efficiency. Buy the Hydrotek HB8-R128D at ProDryers to secure the best market pricing, or request a best price quote for your commercial facility upgrade or multi-unit renovation project today.

Download the Spec Sheet