Thomas Dudley Cascade + Syphon

By Thomas Dudley Product code: 85803 Pack size: Each

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

Technical Specification
Brand Thomas Dudley
Manufacturer ID 334607
Delivery details

DELIVERY OPTIONS (UK mainland only)

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

  • Order before 7pm 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 or £5.00 for orders over £25, 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-7pm Saturday and 9-4pm Sunday. Please check your local branch is open on the branch locator page, before you visit.

Once you have placed your order online, we’ll have it ready for you at the branch 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 branch, the order must be placed by 7pm Monday to Thursday for collection the next day. Orders placed after 7pm 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 Cascade + Syphon is rated 3.7 out of 5 by 13.
Rated 5 out of 5 by from Quality Replaced old syphon that lasted 23 years, I can't see why this won't last as long or more
Date published: 2022-04-15
Rated 5 out of 5 by from excellent value and space saver for tight flush ci space saver value for money
Date published: 2021-09-11
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
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