2 x Dudley Hydroflo Inlet Valve Diaphragm Washers — Revised Blue Version
This Twin Pack of Genuine Thomas Dudley Diaphragm Washers provides a professional-grade solution for maintaining Hydroflo and Aquasave inlet valves. Designed to fix common cistern issues such as constant trickling or slow filling, these washers feature the updated blue plastic insert. Replacing your worn diaphragm with these genuine spares ensures a silent, watertight shut-off and extends the life of your fill valve.
Identification Guide:
Quantity: 2 Washers | Compatibility: Hydroflo & Aquasave Valves | Diameter: 29mm | Version: Revised Blue (Replaces Original White)
Key Features
- Revised Quality: Features the blue insert, the latest official revision from Dudley for improved performance.
- Bulk Value: Convenient twin pack allows for immediate repair plus a spare for future maintenance.
- Wide Compatibility: Perfectly fits Thomas Dudley Hydroflo side and bottom inlet valves used in many UK cisterns.
- Easy Fix: Simple DIY replacement that eliminates the need to replace the entire ball valve assembly.
Installation Tip
The blue item is the revised replacement for the older white version. While the color has changed, the fitment remains identical. Simply unscrew the valve cap, swap the old 29mm washer for the new blue version, and ensure the rubber seating is clean before reassembling.



