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PRODUCT FEATURES
CHOOSING THE CORRECT SIZE DUDLEY SYPHON
There are 6 sizes in the Cascade range. You need to ensure you purchase the correct height otherwise you will not obtain optimal flush AND the syphon may not fit into your cistern (and stop the lid closing!).
There are 2 ways to identify which size syphon you need:
1. Installing a Cascade for the first time or replacing a different syphon with a Cascade: To find the correct height of the required syphon for a cistern, measure the depth of the water level line, within the cistern, normally marked at the back of the cistern, and then add 1” or 25mm to this measurement. This will give you the height of the required syphon. (Cisterns fitted before 2001, would have an original syphon in them that would be approx. 1 ½” or 40mm taller than the current requirements).
See the Dudley video here on how to measure the water line.
2. If you have an existing Cascade and are confident you have the correct size syphon for your cistern then you can just measure the syphon to enable you to choose the correct syphon: See the last photo on this listing which shows dimensions. Where it says 'HEIGHT' that is where you need to measure on your old Cascade syphon to enable you to correctly purchase the correct size syphon. Basically take the measurement from the bottom of the flange of the threaded tail (where the threaded part meets the moulded part that is almost in line with the oblong bulkier part of the syphon to the spillover point of the syphon (which is the bottom of the oblong bell part/moulded ridge on the domed cap at the top end of the syphon). When choosing a syphon the height stated will be the height to the spillover point and not the overall height of the syphon. (i.e. an 8” syphon would be 8” to the spill over, whereas the overall height would be 10”) Below we have listed the possible height sizes and which syphon size that aligns to:
|
HEIGHT cm |
SYPHON HEIGHT TO PURCHASE | SKU (click on the SKU below to take you to the listing for that sized syphon) |
|---|---|---|
| 178 | 7 | FTB12813 |
| 191 | 7.5 | FTB476 (this listing) |
| 203 | 8 | FTB477 |
| 216 | 8.5 | FTB478 |
| 229 | 9 | FTB479 |
| 241 | 9.5 | FTB480 |
SPARES: BE PREPARED
VIDEOS / TECHNICAL DOCUMENT LINKS:
QUESTIONS & ANSWERS:
Q1: Does a toilet syphon have an in built internal overflow?
A1: A syphon can be used as an internal overflow device, as long as the spillover point of the syphon is below any other external hole within the cistern body, normally the lever hole.
Q2: How do I fit a toilet syphon to a close coupled toilet?
https://tyde2104.thomasdudley.co.uk/wp-content/uploads/2021/05/15169-Iss-A-Cascade-Installation-Instructions.pdf When fitting a syphon to a close coupled toilet, you need to ensure that the threaded tail of the syphon is trimmed back, to ensure that the syphon flush is not throttled back, giving you a poor flush. We recommend that the tail is trimmed back to 2-3mm from the back nut.
Q3: How does the dual flush toilet syphon work?
A3: The operation of the dual flush syphon, is to flush and release the lever to give you a full flush, and to flush and hold the lever down, to give you a reduced flush. By holding the lever down, this lifts up two washers (one small blue plastic and one small black rubber) that are located immediately below the metal C link. When these washers are lifted up, this allows air to enter the syphon and breaks the syphonic action, the water level in the cistern will drop to just below the top of the syphon body, therefore giving you a reduced flush
Q4: How does the internal overflow on a toilet syphon work?
A4: A syphon will internally overflow when the water level within the cistern reaches the spillover point. The water will trickle over the spillover point, and run down the downleg of the syphon, and into the toilet bowl.
Q5: What are the two small white plugs for on the side of the syphon?
A5: These are to reduce the flush volume of the syphon within the cistern. By removing the plugs you will reduce the volume of water supplied on the full flush. If no plugs are removed, the water in the cistern will drop to the bottom of the syphon body. If the bottom plug is removed, the water in the cistern will only drop to this level. If the top plug is removed, the water in the cistern will only drop to this level.
