Bathrooms 4 min read Updated 25 March 2026 Trade verified
Best Toilet Fill Valve UK — Ranked by Plumbers
The toilet fill valve is the #1 failure point in UK cisterns. Here are the three worth buying — and the one to avoid.
Need parts for this job?
Trade-priced toilet fill valve in the Plumber.Parts catalog — next-day delivery.
Step-by-step method
Best overall — Fluidmaster PRO 45
Bottom entry, brass shank, adjustable height, 5-year warranty. £14. In every plumber's van.
Best silent fill — Fluidmaster PRO 400
Marketed as 'silent fill'. Marginally quieter, same reliability. £18.
Best side-entry — Dudley Turbo 88
UK-designed, robust, side or bottom entry. £16.
Avoid — Torbeck / cheap generic
Notorious for float arm sticking. Save yourself the callback and skip.
Frequently asked questions
How to know which valve fits my toilet?+
Measure entry: 1/2" (15mm) is universal UK. Note bottom or side entry. Height: Fluidmaster adjusts 220–330mm.
How long should a fill valve last?+
7–10 years in soft water areas, 4–6 years in hard water. Sooner if constant partial fill (float sticking).