Thomas Dudley Beta+ Side Inlet Float Valve — 327640
The Thomas Dudley Beta+ 327640 is a highly versatile side-inlet fill valve designed for use as a replacement in most plastic and ceramic exposed and concealed cisterns. Known for having the largest range of adjustment of any valve on the market, it features a patented multi-directional swivel design that allows the float to be fixed through 180 degrees. This unique flexibility, combined with an extendable float arm, ensures that internal obstructions like syphons or other components can be easily avoided during installation.
Identification Guide:
MPN: 327640 | Connection: 1/2" BSP Brass Tail | Arm Extension: 185mm – 285mm | Pressure Range: 0.1 bar – 14 bar
Key Features
- Heavyweight Brass Tail: Stronger and more durable than standard plastic threads to prevent cross-threading.
- Maximum Flexibility: The unique float arm can be fixed in 3 positions and swivelled 180°.
- Universal Fit: Compact design is fully compatible with furniture, tiles, partitioning, and walls.
- Quiet & Quick: Simple and easy to install, providing reliable performance for low and high-pressure systems.
Technical Support
Access the official manufacturer documentation for installation guidance:
Installation Tip
Before installation, flush supply pipes to ensure the cistern is clean and free from debris. Do not use sealing compounds or solvents in contact with plastic or rubber surfaces; hand-tightening plus a 1/4 turn is recommended for an adequate seal. This valve is supplied with an air gap as standard to comply with water regulations.



