Dudley 8.5” Hydroflo Compact Delay Fill Bottom Inlet Valve with Brass Tail – 2025 Upgraded Version (370909)

Now Even More Reliable, Durable & Easy to Maintain

The Dudley Hydroflo 8.5” Compact Delay Fill Bottom Inlet Valve (370909) is a WRAS-approved, water-saving solution designed for modern ceramic and plastic cisterns. With a compact design that fits even the tightest installations, this professional-grade inlet valve ensures smooth, quiet, and efficient water refilling while reducing unnecessary water usage.

The 2025 upgraded version introduces a stronger, simpler, and more user-friendly design, making installation and maintenance easier than ever.

2025 UPGRADED FEATURES:

• New 2-Piece Filter System – Replaces the old 3-piece filter for quicker servicing and improved durability.
• No Filter Extraction Key Required – Eliminates the risk of outlet valve obstructions for uninterrupted performance.
• Enhanced Strength & Reliability – Built to last with upgraded materials.
• Simplified Installation & Maintenance – Fewer parts mean less hassle and reduced servicing time.

PRODUCT FEATURES & BENEFITS:

• Product Code: 370909
• Compact Design – Perfect for tight cistern installations, ensuring the float never catches on the syphon or flush valve.
• Adjustable Waterline Range (140mm - 220mm) – Suitable for various cistern sizes.
• Professional ½” Brass Tail – Provides long-lasting durability and secure connections.
• Water-Saving Delay Fill Action – Prevents refilling until after the flush cycle is complete, reducing water waste.
• Integrated Quiet Fill Technology – Designed for minimal noise during refilling.
• Flow Regulation for All Water Pressures – No manual adjustments needed, saving time during installation.
• Unique Float Arm Design – Ensures the float cannot detach, preventing malfunctions.
• WRAS Approved – Fully compliant with UK water regulations for guaranteed quality and performance.

WHY CHOOSE THE 2025 UPGRADED MODEL?

• More Efficient & Reliable – The new design simplifies maintenance and reduces potential faults.
• Easier Installation & Servicing – No tools required for filter removal.
• Stronger & More Durable Build – Built with upgraded materials for long-term use.

The Dudley 8.5” Hydroflo Compact Delay Fill Bottom Inlet Valve (370909) is ideal for plumbers, DIY enthusiasts, and professionals looking for a high-performance, easy-to-maintain, and water-efficient solution.

DETAILS

SPARES:  BE PREPARED -  The diaphragm in this Inlet valve will perish over time and diminish the flushing mechanism.   Consider purchasing a spare washer so you have it at hand when needed.  The link is here.

INSTRUCTIONS:  Instructions for the Inlet Valve can be found here. 

CHOOSING THE CORRECT SIZE 

There are 9 sizes in the Hydroflo Airgap Compact Float Valve.  You need to ensure you purchase the correct height please see second image.

FAQs

Q1. How do Dudley fillings valves cope with high and low water pressure.

The current range of fully compliant Hydroflo inlet valves, come pre-fitted with a flow regulator, so no need for a flow restrictor. Our previous range were supplied with a flow restrictor, which needed to be removed for water pressures below 1.5 bar. As these inlet valves operate on an equilibrium principle, which uses the supply water pressure against itself to operate the valve they are suitable for use on water pressures between 0.1 bar and 14 bar.

Video for Hydroflow Inlet Valve 

Dudley Hydroflo compact delay fill bottom inlet valve with brass tail 370909

FTB12740