Thomas Dudley Ltd S7 Cascade Siphon 229mm (8121F)

£ 10.89INC VAT

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Thomas Dudley Ltd S7 Cascade Siphon 229mm (8121F)

1-piece cascade siphon. Convertible 6, 7 and 9Ltr adjustable flushing volumes. Compatible with most lever-operated cisterns. LL HL cone rings supplied.

  • Water Efficient
  • Manufactured in the UK
  • Single-Flush
  • Adjustable Flushing Volumes
  • Suitable for Low Level Use
  • Easy to Install
  • Internal Overflow
  • 5 Year Manufacturer's Guarantee

More Info

View all: Thomas Dudley Ltd Fill & Flush Valves

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Thomas Dudley Ltd S7 Cascade Siphon 229mm is rated 4.4 out of 5 by 37.
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Rated 5 out of 5 by from All good. All good. Very easy to fit. You tube is your friend
Date published: 2020-01-06
Rated 3 out of 5 by from Not very impressed Fitted this item as soon as I connected the water filled up the toilet the yellow bung floated away so now I'm only flushing at half capacity, no way of getting it to stay in just keeps coming out
Date published: 2019-08-18
Rated 5 out of 5 by from T DUDLEY S7 CASCADE SIPHON Very easy to fit and works a treat . Keep hold of your old link that hooks on to the flush handle .You may need it as on mine the link was too short to reach the handle .But easy fix .Just link the old and new together . Instructions are not so good yello tab on the unit i have left as it is and works great .The yellow tab is the guide for 6,7,or 9 litre flush .Other than that very easy to fit .dont go paying for someone to do it for you .it really is too easy . Also size of siphon doesnt really matter .My old one was 325mm .This is 229mm .Just dont go bigger or for obvious reasons the tank lid wont go back on .
Date published: 2019-08-11
Rated 5 out of 5 by from Quality and easy to fit I’ve used these siphons multiple times and Haven't been let down yet. Easy to fit and maintain!
Date published: 2019-04-18
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Flush lever & siphon return function

I've fitted this TD siphon and post flush it remains elevated. For the next flush we have to manually return the lever to the upper position / return siphon to its lower position - is this normal or is the siphon missing a return spring?
Asked by: Barton99

Can I replace 9.5 inches syphon with 9 inches syphon ? ( single flush)

I have got an old Armitage shanks free flow 9.5 inches Syphon, can I swap it to 9 inches Thomas Dudley s7 cascade
Asked by: Shilgit

Internal overflow

I have purchased this from Screwfix and on the list of features it said it had an internal overflow. I purposely overfilled the system but no internal overflow seemed to come into play. Was this advertised correctly?
Asked by: coal
Thank you for your enquiry, We would like to know some more information if possible. Could you tell me what type of cistern the Syphon was fitted into, or how this was tested ? The Internal overflow is designed to allow excess water, once it reaches the “ Spill Over Point of the Syphon “ to overflow into the down leg, and then into the Toilet Pan. ( Normally this is caused by a failure of the diaphragm washer of the inlet valve, allowing a small amount of water to gradually fill the cistern with water ) The internal Overflow is not designed to take a Full Bore failure of the inlet valve. i.e the Rapid filling of the cistern with water I trust that this helps, but if you need any more information, please give our team a call on 0121 530 7000 Kindest Regards Thomas Dudley Sales Team
Answered by: Dudley Sales TDL
Date published: 2020-06-21

I apper to have a 9 1/2" Cascade siphon. Will a 9" version be OK to fit?

Asked by: Snorch
Good Morning, you will need to check your water level in the cistern first, if you have an 8" waterline then a 9" syphon will be fine to fit into the cistern. It is important to keep a 1" gap from the water level and the internal overflow height. All our Syphon measurements are to the internal overflow height, not the overall height of the syphon. Kind Regards, The Sales Team
Answered by: Dudley Sales TDL
Date published: 2020-02-20

Thomas Dudley S7 Siphon not flushing correctly

Cistern only half empties irrespective of how plug and flap are fitted. Unit is single flush. Previous unit worked well until diaphragm split. Could replacement unit be faulty or is there a simple solution. Support appreciated.
Asked by: mJohn
Sorry, its sorted. Should have worked out yellow flap arrangment before I installed it. I was just removing and installing flap without realising you had to position it over the triangular hole!!
Answered by: mJohn
Date published: 2019-11-04
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Specification
Brand Thomas Dudley Ltd
Connection Type 1½" BSP Connection
Manufacturer Guarantee 5 Year Manufacturer's Guarantee (T&Cs Apply)
Pack Size 1
Pieces in Pack/Case 1
Product Height 290 mm
Product Length 229 mm
Product Type S7 Cascade Siphon
Toilet Fitting Type Fill & Flush Valves
Volume 6, 7, 9 Ltr

Product contents

Siphon, backnut, seal, coupling nut, washer, lever c-link, low level and high-level cone rings.