Thomas Dudley Niagra Mechanical DualFlush Flush Valve

By Thomas Dudley Product code: 20200 Pack size: Each

Product Details

• WRAS approved.
• 3 year product warranty
• Ideal for use as a replacement in most ceramic or plastic exposed cisterns with an internal height of 330mm to 408mm

• Stylish chrome plated push button sits neatly into the cistern lid and incorporates easily recognisable segments for full and reduced flushes.
• Bayonet fixing allows easy access for maintenance
• Long life silicone rubber seal
• Moveable top plate for lateral button adjustment
• 53mm (2”) Outlet as standard.
• Water saving – 6/4 litre dual flush.

• All product component replacement parts available see
• Water technology list registered

Technical Specification
Brand Thomas Dudley
Manufacturer ID PSPOVN313348
Pack Size 1
Delivery details

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery – £5.00 or FREE for orders over £25

  • Order before 9pm Monday to Thursday for next business day delivery
  • Order Friday to Sunday before 5pm for Monday delivery
  • Orders placed after Sunday at 5pm will be delivered the following Tuesday
Pre-12pm Delivery – £10.00 to arrive before 12pm on the scheduled days above
Saturday Delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 6pm Friday)
Sunday delivery – £10.00 or £5.00 for orders over £25 & FREE for orders over £75 (order by 4pm Saturday)
Times may vary for items being delivered directly from the supplier. For more information, please visit our delivery information page below.
Items over 30kg can only be delivered from Monday to Friday. If ordered before 6pm, please allow up to two business days for delivery. Orders placed after 6pm Thursday will be delivered after the weekend.
More about Delivery
Click & Collect details

Collection Details

Our opening times are 7am-8pm Monday-Friday, 7am-6pm Saturday and 9-4pm Sunday. Please check your local store is open on the store locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the store you have selected in as little as 5 minutes. We will hold your order for 14 days, after which we will automatically generate a refund to the payment type you used to place the order.

Don’t forget your mobile number – Make sure your mobile number is added so that we can text you when your order is ready to collect. Please wait for your text or email before coming to collect your items.

If an item is eligible for Next Business Day Collection in store, the order must be placed by 9pm Monday to Thursday for collection the next day. Orders placed after 9pm on Thursday, and up to 5pm on Sunday, will be available for collection on Monday. For larger items over 30kg, please allow two business days.

Thomas Dudley Niagra Mechanical DualFlush Flush Valve is rated 4.7 out of 5 by 36.
Rated 5 out of 5 by from Good quality replacement flush valve Seems good quality and works well. Easy to adjust and set up both the overflow and the flush volume. Just remember when measuring the height that it is the cistern and the lid. If you measure just the cistern, then you will cut the rods too short
Date published: 2023-05-26
Rated 4 out of 5 by from Well made and easy to fit Easy to fit and set up, but hard water means they only last a couple of years
Date published: 2023-05-20
Rated 5 out of 5 by from Highly Recommended Excellent replacement and easy to replace,Home delivery a God sent by Toolstation. Highly recommend without any hesitation
Date published: 2023-03-20
Rated 3 out of 5 by from Not DIY Only bought it to replace one that had Broke setting up controlers on top is was a pain getting them the right length if only i could have used ones from broken one
Date published: 2023-02-19
Rated 5 out of 5 by from Very easy to install no need plumbers to higher Very smart design and easy installation no need plumbers to higher ????
Date published: 2023-02-15
Rated 4 out of 5 by from The 'Curate's egg' of flush valves Very good in the lower parts. Sturdy construction, and a valve seal and seat that is a cut above the normal floppy big silicone washer varieties. Looks like it will last and be easy to clean. The part flush adjustable cup mechanism is simple, robust and easy to adjust. The outlet washer looks a trifle thinner than normal but sealed fine when done up tightly. Flush produces a good volume of water, rapidly delivered. But the gubbins above the flush buttons is a queer rickety assembly that seems to be trying to solve a strange non-existent problem. It makes the flush button assembly perched above it impossible to fix down really tightly because it's perched above all the wobbly plastic, with the instructions urging you not to 'overtighten' the fixing screw. The push buttons look cheap and flimsy. In the end, I chucked it all away as the weird spidery retaining mechanism easily unclips from the top of the valve, and installed a standard push button/push rod fitting. This locked down firmly and satisfyingly with the usual ring-nut type fixing - no more wobbly buttons!
Date published: 2022-11-09
Rated 5 out of 5 by from All good Did the job. Easy to install
Date published: 2022-10-29
Rated 5 out of 5 by from Dualflush Valve Awesome product and easy to install. Well made with a quality finish.
Date published: 2022-09-26
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