Dudley Niagara Dual Flush WC Flush Valve — 2" Outlet — WRAS (313348)
Dual Flush 6/4L WRAS Approved 2" (51 mm) Outlet Top Flush Button Service < 5 mins Bayonet Removal
The Dudley Niagara is a reliable, dual-flush WC flush valve with a 2" (51 mm) outlet. It’s WRAS approved, manually operated via a chrome-plated lid button, and designed for quick maintenance thanks to its bayonet fitting — remove the valve body in minutes without disconnecting water or dismantling the cistern.
? Upgrade Notice: The newer 2025 version of the Dudley Niagara will be supplied (see Image 2). This upgraded model replaces the older design shown in some documentation.
Compatibility: For close-coupled or low-level WC cisterns with internal height 330–408 mm. Suits many exposed plastic/ceramic cisterns. Top-flush button mounts in cistern lid.
Key features
- Dual flush (6/4 L typical) with clearly segmented button
- WRAS approved performance
- 2" (51 mm) outlet — optional adaptor to 1½" (38 mm)
- Bayonet fitting — lift out valve body for fast servicing
- Silicone outlet seal for long life
- Chrome push button as standard; gold-effect also available
- Max width 85 mm — suits many narrow/portrait cisterns
- Now shipping the 2025 upgrade version
Size & format
- MPN: 313348
- Outlet: 2" (51 mm) — adaptor available to 1½" (38 mm)
- Cistern height: 330–408 mm internal
- Activation: Top-flush chrome-plated button (lid-mounted)
- Service time: typically < 5 minutes (bayonet removal)
What’s included
- 1 × Dudley Niagara dual-flush valve (2025 version)
- 1 × Chrome dual-flush button (lid mount)
- 1 × Silicone outlet seal
Check before you buy
- Your cistern’s internal height is 330–408 mm
- Your outlet is 2" (or you’ll use the 1½" adaptor)
- You have a top-flush lid button
- You’re happy to receive the new 2025 upgraded version
FAQs
Will I get the new version?
Yes — all orders now ship with the latest 2025 upgrade (see Image 2).
Will this fit a narrow cistern?
Yes — the Niagara’s maximum body width is about 85 mm, making it suitable for many narrow/portrait cisterns.
Do I need to remove the cistern to service it?
No — the bayonet fitting lets you lift out the valve body without disconnecting the water or dismantling the cistern.
Is the button included?
Yes — a chrome-plated dual-flush button is included. A gold-effect option is available separately.