Fluidmaster, PRO45, Toilet Fill Valve

Fluidmaster® PRO45 Fill Valve – Quiet, Adjustable, and Built for Professional Installations

The Fluidmaster® PRO45 Fill Valve is engineered for high-performance toilet tank refills in both residential and commercial settings. Known for its ultra-quiet operation and durable construction, this adjustable fill valve is a trusted solution for contractors who demand reliability and code-compliant components.

Professional-Grade Performance in Every Detail

Featuring Fluidmaster’s precision anti-siphon design, the PRO45 delivers consistent refill rates while minimizing noise and water hammer. Its heavy-duty construction, coupled with simple height adjustment and fast refill capability, makes it suitable for all brands and styles of gravity-fed toilets.

Key Features

• Quiet Fill Technology – Designed with a custom shank for ultra-quiet operation during tank refills.
• Integrated Water Hammer Arrestor – Reduces shock in the system, protecting internal piping from pressure surges.
• Adjustable Height Range – Fits tank heights from 9” to 14”, allowing versatile installation in a wide range of toilet models.
• Anti-Siphon Certified – Prevents backflow contamination; meets all plumbing code requirements.
• Universal Compatibility – Fits all major toilet brands using a standard 2-piece fill valve configuration.
• Fast Refill Design – Optimized refill rate for efficient tank cycling and consistent performance.

Technical Specifications

• Product Type: Adjustable toilet fill valve
• Model: PRO45
• Material: High-impact plastic with corrosion-resistant components
• Connection Type: 7/8" ballcock shank
• Operating Pressure: 20–80 PSI
• Adjustment Range: 9" to 14" tank height
• Warranty: 5-Year limited manufacturer warranty
• Certifications: UPC/cUPC, ASSE 1002, CSA

Installation Guidelines

Installation is straightforward using standard tools. Valve height is adjustable by hand for a precise tank fit. Final adjustment should ensure that the critical level (CL) mark remains at least 1” above the overflow tube in compliance with plumbing codes. Secure the shank nut and inlet connection to manufacturer torque specs to avoid cross-threading or leaks.

Preferred by Plumbing Professionals

The Fluidmaster PRO45 is the preferred choice of contractors for high-volume repair and replacement jobs. Its reliability in demanding applications, code compliance, and quiet operation make it an essential part of any service truck inventory.