Thomas Dudley Cascade + Syphon

By Thomas Dudley Product code: 85803 Pack size: Each

£9.98 Exc. VAT £8.32

Product Details

• Suitable for low-level use and 7/9 litre
• 229mm (9”), long-tail 67mm link the smallest and most compact 1 piece syphon available
• 5 year warranty
• Fits into most syphon operated cisterns
• Duoflush facility provides full and water-saving reduced flushing
• 38mm (1.1/2”) outlet

Spares readily available see

Delivery details

Covid-19 Update

  • FREE Next Business Day delivery is available for orders over £25 for orders placed before 9pm Mon-Thur and before 6pm Sunday
  • Saturday and Sunday delivery is available for orders placed before 6pm on Friday for Saturday Delivery and 4pm Saturday for Sunday delivery. Items over 30kg can only be delivered next Business Day Mon-Fri. Orders placed after 9pm Thursday will be delivered the following Monday see here for details
  • Pre-12 delivery service is now available for weekday deliveries. Place your order before 9pm Mon-Thur for next business day delivery by 12pm. Orders placed after 9pm Thur and before 6pm Sunday will be delivered by 12pm Monday. UK mainland only
  • Once your order has been dispatched you will receive an invoice email with the courier details and your tracking number
  • Alternatively go to MyAccount, click on your Order History, click on the TRACK icon to link through to the carrier website and the tracking details for your delivery
  • Delivery direct from suppliers is available and specific delivery times will be displayed on the product page
Order Value: Under £25 Over £25 but less than £75 £75 & Over
Next Business Day Mon-Fri (order by 9pm Mon-Thur & Sun by 6pm) delivered before 6pm £5 Free Free
Pre-12 Delivery Mon-Fri (order by 9pm Mon-Thur & Sun by 6pm) delivered before 12pm next day £10 £5 £5
Remote areas standard delivery (2-4 days) £5 Free Free
Saturday Delivery (order by 6pm Friday) delivered before 6pm £10 £5 Free
Sunday Delivery (order by 4pm Saturday) delivered before 6pm £10 £5 Free

Please note items delivered by our suppliers are not available for the options above. Delivery times may vary.

More about Delivery & Returns
Click & Collect details

Covid 19 Update

Click & Collect

We are fully open and delighted to welcome our customers into our branches.

Our opening times are 7am-8pm Monday-Friday, 7am-7pm Saturday and 9-4pm Sunday

Our speedy 5 min Click and Collect service remains one of the safest ways to buy from us and minimises your time in store. Place your order at 7 days a week, and travel to store once your collection confirmation is received by email or text message.

Don’t forget your mobile number – Please ensure that your mobile number is added so that we can text you when your order is ready to collect.

Your items will be held at your selected Toolstation branch for 14 days, after which point your order will be put back to stock and refunded automatically.

Thomas Dudley Cascade + Syphon is rated 3.2 out of 5 by 9.
Rated 1 out of 5 by from Disappointed plumber This Dudley syphon is terrible I have been a plumber since 1964 I still have my own business I employ plumbers .This was for one of my rented properties. I was extremely carful fitting because of the bad reviews . Unfortunately I had very little space to work with,so had to use this syphon req 2 good pumps of handle to work .Very poor very disappointed.
Date published: 2021-05-17
Rated 2 out of 5 by from Poor flush I have fitted 10 of these siphons at different properties. I had to replace 2 even though I fitted them the same way as the others because of poor flush. These did not work on 9.5 litre flush. I won’t fit these again. I’ll stick with the Fluidmaster.
Date published: 2020-11-13
Rated 4 out of 5 by from Ideal if cistern space is a premium. Cheap and cheerful. I went with it simply as the siphon is one of the smaller ones available and did not impede the float where the inlet and flush are inexplicably on the same side of the cistern. Flush feels slightly flimsy compared to my old one but it works every time which is good enough for me.
Date published: 2020-08-07
Rated 5 out of 5 by from Fits nicely in the small cisterns A good syphon for those small toilet cisterns.
Date published: 2020-06-22
Rated 1 out of 5 by from Buy item 32789 instead This item is rubbish. Mechanism cheap and doesnt flush properly. I returned it bought item 32789 which, as far as bog flushers go, is fantastic! .... and worked out cheaper because it comes with the handle so the handle I bought to go with the Thomas Dudley went back too.
Date published: 2020-06-21
Rated 2 out of 5 by from Wish i had purchased cheaper! I have been using the cheaper version, but because this cistern was hard to access i decided to purchase this more expensive one! The threads on the nut were very weak and kept jumping before the washer was watertight! After 3 attempts and nearly 2 1/2 hours, using sealer and finding an old nut i finally managed to be watertight! Success!!....NO, the unit would only flush when it wanted to and that wasn't very often!!! I then went back the next day and purchased my usual cheap siphon (Fluidmaster 77721), 1/2 hour later all fitted, sealed first time and flushes every time!! Now time to return this one for a refund.
Date published: 2020-06-19
Rated 5 out of 5 by from Easy fit with plenty of spare room Fitted awkward shires paddle handled cistern, much improved flush with flush water amount adjustment
Date published: 2020-05-26
Rated 4 out of 5 by from Basic but it works. I bought this on the advice of my plumber because the cistern wasn't very wide and the first unit I had purchased simply wouldn't fit. The siphon was a little sticky when first fitted, needing a couple of pushes to flush bit this quickly settled down and it now works easily. Good value compact siphon that does the job.
Date published: 2020-04-28
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