Item Description
Dudley S9 Hi-Flo 7.5" Dual Flush Syphon — 317963
WRAS Approved 7.5" Height DuoFlush
The Thomas Dudley S9 Hi-Flo (317963) is a premium, WRAS-approved one-piece toilet syphon designed for maximum reliability in both high and low-level installations. Measuring 7.5 inches (191mm) to the spillover point, this 38mm (1.5") outlet syphon features DuoFlush technology, allowing for significant water savings. It is the industry standard for a leak-free flush, as syphons naturally prevent the continuous water wastage often seen with faulty flush valves.
Identification Guide:
MPN: 317963 | Height: 7.5" (191mm to spillover) | Outlet: 38mm (1.5") | Flush: 6/7/9 Litre Dual Flush
Choosing the Correct Size
To ensure your cistern lid closes and flushes correctly, measure from the bottom of the threaded tail flange to the moulded ridge on the domed cap (Spillover Point).
| Height (mm) | Size to Buy | SKU |
|---|---|---|
| 191 | 7.5" | FTB1337 |
| 203 | 8" | FTB12814 |
| 229 | 9" | FTB474 |
Technical Support
- Dual Flush: Release lever for full flush; hold lever down for reduced flush.
- Overflow: Built-in internal overflow protection.
- Maintenance: Diaphragms perish over time; click here for spare diaphragm (FTB475).
- Video Guide: How to measure your water line.
- Data Sheet: Download Technical Specs.
Need help figuring out if this product is right for your setup?
Send us your best bathroom selfies (or, you know, just your bathroom setup pics) to [email protected] or WhatsApp 07359 625424 us, and we'll help you flush your confusion away!