Description
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
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Heavy-Duty Brass Shank – Superior durability that won't crack, corrode, or strip over time
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Ultra-Quiet Operation – Special shank design eliminates noise and water hammer
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Professional Grade – Preferred by professional plumbers for reliability and performance
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Universal Compatibility – Fits all toilet brands and cistern types
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Bottom Entry Design – 1/2" (12.7mm) connection for standard UK installations
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Easy Installation – Quick-fit design with clear instructions
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Code Approved – Meets all relevant plumbing regulations
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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:
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Won't Crack: Brass withstands stress and impact that would crack plastic
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Won't Corrode: Resistant to water-related corrosion and mineral buildup
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Won't Strip: Brass threads maintain integrity through repeated installations
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Longer Lifespan: Outlasts plastic valves by years in demanding installations
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Better Seal: Rigid brass provides superior sealing against leaks
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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
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Residential Bathrooms: Replace worn or faulty fill valves
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Rental Properties: Durable solution for high-turnover installations
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Commercial Installations: Hotels, offices, restaurants, care facilities
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New Builds: Specify for reliable, long-lasting performance
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Renovations: Upgrade existing toilet cisterns
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Maintenance Contracts: Stock for quick repairs and replacements
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Quiet Environments: Hospitals, libraries, residential care homes
Installation Guide
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Turn Off Water: Shut off water supply to toilet cistern
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Drain Cistern: Flush toilet to empty cistern completely
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Disconnect Supply: Remove water supply line from old fill valve
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Remove Old Valve: Unscrew locknut and remove old fill valve
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Install PRO45B: Insert new valve through cistern hole from inside
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Secure Valve: Hand-tighten locknut from underneath, then use wrench for final tightening
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Connect Supply: Attach water supply line to brass shank
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Adjust Water Level: Set float to desired water level (typically 1" below overflow)
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Test Operation: Turn water back on and check for leaks
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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:
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Invented the Fill Valve: Pioneered the technology in 1958
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Global Leader: Trusted by plumbers worldwide
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Proven Reliability: Decades of engineering excellence
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Professional Grade: PRO range represents their highest quality
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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.
