The Fluidmaster PRO45B Professional Fill Valve is the trusted choice of professional plumbers across the UK. Engineered with a heavy-duty brass shank that won't crack, corrode, or strip, this bottom-entry fill valve delivers exceptional durability and ultra-quiet operation. Fluidmaster pioneered fill valve technology in 1958, and the PRO45B represents decades of innovation and reliability.
Key Features & Benefits
Heavy-Duty Brass Shank – Superior durability that won't crack, corrode, or strip over time
Ultra-Quiet Operation – Special shank design eliminates noise and water hammer
Professional Grade – Preferred by professional plumbers for reliability and performance
Universal Compatibility – Fits all toilet brands and cistern types
Bottom Entry Design – 1/2" (12.7mm) connection for standard UK installations
Easy Installation – Quick-fit design with clear instructions
Code Approved – Meets all relevant plumbing regulations
5-Year Warranty – Long-term peace of mind from the industry leader
What's Included
Fluidmaster PRO45B fill valve with brass shank
Adjustable float mechanism
Mounting hardware and washers
Installation instructions
5-year manufacturer's warranty
Technical Specifications
Model: PRO45B
Manufacturer: Fluidmaster
Connection Type: Bottom entry
Connection Size: 1/2" (12.7mm)
Shank Material: Heavy-duty brass
Float Type: Adjustable
Water Level Adjustment: Tool-free height adjustment
Compatibility: Universal – fits all toilet brands
Maximum Water Pressure: 150 psi (10.3 bar)
Warranty: 5 years
Certification: Code approved, meets UK plumbing regulations
Barcode: 039961455420
SKU: K07084
Why Choose Brass Over Plastic?
The PRO45B's heavy-duty brass shank offers significant advantages over plastic-shanked alternatives:
Won't Crack: Brass withstands stress and impact that would crack plastic
Won't Corrode: Resistant to water-related corrosion and mineral buildup
Won't Strip: Brass threads maintain integrity through repeated installations
Longer Lifespan: Outlasts plastic valves by years in demanding installations
Better Seal: Rigid brass provides superior sealing against leaks
Professional Quality: Preferred by plumbers for reliability
Ultra-Quiet Operation
The PRO45B's engineered shank design significantly reduces operational noise and eliminates water hammer:
Special flow control prevents sudden pressure changes
Smooth water delivery reduces turbulence and noise
Eliminates the "banging" sound common with inferior valves
Ideal for residential bathrooms, hotels, and quiet environments
Reduces complaints in multi-occupancy buildings
Universal Compatibility
The PRO45B fits all major toilet and cistern brands including:
Ideal Standard
Armitage Shanks
Roca
Geberit
Twyford
Duravit
Villeroy & Boch
And virtually all other brands with 1/2" bottom-entry connections
Applications & Use Cases
Residential Bathrooms: Replace worn or faulty fill valves
Rental Properties: Durable solution for high-turnover installations
Commercial Installations: Hotels, offices, restaurants, care facilities
New Builds: Specify for reliable, long-lasting performance
Renovations: Upgrade existing toilet cisterns
Maintenance Contracts: Stock for quick repairs and replacements
Quiet Environments: Hospitals, libraries, residential care homes
Installation Guide
Turn Off Water: Shut off water supply to toilet cistern
Drain Cistern: Flush toilet to empty cistern completely
Disconnect Supply: Remove water supply line from old fill valve
Remove Old Valve: Unscrew locknut and remove old fill valve
Install PRO45B: Insert new valve through cistern hole from inside
Secure Valve: Hand-tighten locknut from underneath, then use wrench for final tightening
Connect Supply: Attach water supply line to brass shank
Adjust Water Level: Set float to desired water level (typically 1" below overflow)
Test Operation: Turn water back on and check for leaks
Fine-Tune: Adjust water level if needed for optimal flush performance
Water Level Adjustment
The PRO45B features tool-free water level adjustment:
Simply twist the adjustment rod to raise or lower the float
No tools required for height adjustment
Fine-tune water level for optimal flush performance
Prevents overflow while ensuring adequate flush volume
Troubleshooting Common Issues
Continuous Running: Check float adjustment, ensure valve seats properly, inspect for debris
Slow Fill: Check water supply pressure, clean inlet screen, verify supply line isn't kinked
Noisy Operation: Ensure valve is fully seated, check for debris in valve body
Leaking at Connection: Tighten locknut, check washer condition, ensure proper seating
Maintenance & Servicing
The PRO45B requires minimal maintenance:
Periodically check water level and adjust if needed
Inspect for leaks at connection points annually
Clean inlet screen if fill rate slows
Brass construction resists mineral buildup better than plastic
Replacement parts available if needed (though rarely required)
Why Choose Fluidmaster?
Fluidmaster is the world's leading manufacturer of toilet fill valves and cistern components:
Invented the Fill Valve: Pioneered the technology in 1958
Global Leader: Trusted by plumbers worldwide
Proven Reliability: Decades of engineering excellence
Professional Grade: PRO range represents their highest quality
Comprehensive Warranty: 5-year coverage demonstrates confidence in quality
Bottom Entry vs Top Entry
This is a bottom entry fill valve, meaning the water supply connects from underneath the cistern. Bottom entry valves offer:
Cleaner appearance (no visible supply line)
More common in UK installations
Better suited to close-coupled toilets
Standard 1/2" connection size
Ensure your toilet has a bottom-entry configuration before purchasing. If your water supply enters from the side of the cistern, you need a side-entry valve instead.
Code Approval & Regulations
The PRO45B meets all relevant UK plumbing regulations and building codes:
Complies with Water Supply (Water Fittings) Regulations
Approved for use in potable water systems
Meets British and European standards
Suitable for professional and DIY installations
About Fluidmaster
Since inventing the fill valve in 1958, Fluidmaster has been the global leader in toilet repair and replacement parts. The PRO45B represents their commitment to professional-grade quality, backed by decades of engineering expertise and innovation. Fluidmaster products are specified by plumbers, contractors, and property developers worldwide for their reliability and performance.
Perfect for: Professional plumbers, bathroom installers, property maintenance teams, facilities managers, landlords, and competent DIY enthusiasts seeking reliable, long-lasting, ultra-quiet toilet fill valve performance with professional-grade brass construction.
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