Derwent Macdee Metro 1-Piece Toilet Cistern Syphon Compatible models / MPNs: DSY0225 (8″), DSY0325 (9″) · Suitable for Fordham & Twyford cisterns
NOTE: This is the one-piece Metro syphon (not the 3-piece “Rapid”). Choose the correct height (8″ or 9″) for your cistern.
Product Features
- WRAS Approved Metro 1-piece syphon for lever-flush cisterns.
- Flush volume selector with 6/7/9 litre settings.
- Available heights: 8″ (DSY0225) and 9″ (DSY0325).
- 1½″ outlet.
- Supplied with: syphon back nut, flush pipe coupling nut, syphon seal, and low-level flush pipe seal.
- For internal overflow setups: measure from cistern base to waterline and add 1″; this final level must be at least 10 mm below any cistern aperture.
- Current production supplied in black. Replaces earlier white/white & blue or grey versions. Note: parts between old and new colour versions are not interchangeable.
Details
- Suitable for many Fordham and Twyford branded cisterns that used the Metro one-piece syphon.
- This one-piece Metro differs from the Metro Rapid (3-piece) which has a quick-release service nut. For one-piece units, diaphragm servicing typically requires cistern removal.
- MPNs covered on this page (for search/identification): DSY0225 (8″), DSY0325 (9″).
Choosing the Correct Size (8″ vs 9″)
Method A – New Install / Different Syphon
- Measure from the bottom of the cistern to the waterline.
- Add 25 mm (~1″) to this measurement.
- Ensure the result is at least 10 mm below any cistern aperture/overflow.
- Select the nearest height: 8″ (DSY0225) or 9″ (DSY0325).
Method B – Like-for-Like Replacement
- Check your existing syphon’s label or paperwork for DSY0225 or DSY0325, or measure overall height.
- If unsure, compare the existing height to the 8″ and 9″ options and choose the closest match.
Select your required size from the dropdown at the top of this page.
Questions & Answers
Will this replace my existing Fordham/Twyford syphon?
In many cases, yes. These Derwent Macdee Metro 1-piece models (DSY0225 8″ / DSY0325 9″) were commonly fitted in Fordham and Twyford cisterns. Match the height and outlet size (1½″).
What’s the difference between Metro 1-piece and Metro Rapid (3-piece)?
The Metro Rapid is a 3-piece syphon with a quick-release nut allowing diaphragm changes without removing the cistern. The Metro 1-piece (this product) is a fixed body; servicing typically requires removing the syphon.
Colour difference – does it matter?
Current production is supplied in black and replaces earlier white/white & blue or grey versions. Function and shape are equivalent; however, parts are not interchangeable between colour generations.
MPNs covered: DSY0225 (8″), DSY0325 (9″). WRAS approved, 1½″ outlet, 6/7/9 litre selector.