Fluidmaster, 400LS, Toilet Fill Valve

Fluidmaster® Leak Sentry® Fill Valve – Advanced Fill Control with Built-In Leak Protection

Designed for high-performance and efficiency, the Fluidmaster® Leak Sentry® Universal Fill Valve is an ideal choice for professionals seeking an upgrade that prevents water waste and reduces callbacks. Featuring integrated leak detection and a precision water control mechanism, this valve automatically locks out refills when a potential leak is detected—protecting both the plumbing system and the end user’s utility costs.

Engineered for Reliability and Efficiency

The Leak Sentry® model incorporates Fluidmaster’s trusted anti-siphon technology and is fully adjustable for tank height and refill volume. A water-saving roller clamp allows for precise adjustment of bowl refill levels, improving flush performance while reducing excess water usage. It’s a smart choice for both service and remodel applications.

Professional-Grade Features

• Leak-Sensing Technology – Automatically halts tank refill to flag continuous flow issues or flapper failure.
• Manual Reset Mechanism – Easily reset the valve from lockout by simply actuating the flush lever.
• Adjustable Bowl Refill Clamp – Provides control over bowl fill volume to match toilet performance specs.
• Universal Design – Replaces standard fill valves including Fluidmaster 400 series and 400LG leak guard models.
• Quiet Fill Performance – Engineered for near-silent operation in both residential and light commercial settings.
• Code-Compliant – ASSE-certified anti-siphon fill valve for backflow protection.

Specifications

• Model: PRO45 with Leak Sentry® functionality
• Installation Height: Adjustable 9”–14” range
• Inlet Connection: Standard 7/8" ballcock thread
• Material: High-strength polymer body
• Certifications: ASSE 1002, CSA B125.3, UPC
• Warranty: 5-Year Limited

Installation & Usage Notes

This valve is designed for quick install and service. Contractors should ensure the critical level mark (CL) is placed at least 1” above the top of the overflow tube to meet code. After installation, the valve may lock out if a continuous leak is present; always verify flapper and flush valve integrity before reset. Use standard tank-to-bowl tools and a torque-controlled wrench to secure the fill valve.

Contractor Advantages

Leak Sentry® technology is ideal for property managers, maintenance crews, and residential plumbers looking to reduce nuisance water loss. This feature alone can prevent overflows and minimize service calls by alerting users to issues before they escalate. It’s a valuable addition to your inventory for any high-efficiency or repair-focused job.