Which height adjustable siphon to buy?

[@TonyC]

I am planning to buy a height adjustable siphon to use in a new WC cistern instead of the supplied siphon. My three candidates are:

1. The Dudley Turbo Edge Siphon
2. The Fluidmaster Ultra Dual Flush Siphon.
3. The Wirquin MacDee Motion Siphon

Each manufacturer claims that its product is compact enough to fit in any modern lever operated cistern, is height adjustable, and has dual flush and internal overflow capability. And all three allow the bell housing assembly to be removed for maintenance without having to empty and dismantle the cistern. Basically, everything I need.

Does anyone have any experience of using at least two of these siphons and, consequently, has a preference for one over the other? Any one of these that I should avoid at all costs?

Looking on the Wolseley Web site, the Dudley and Fluidmaster siphons are about the same price, but the Wirquin MacDee siphon is considerably cheaper for some reason.

 

[Ben-gee]

Get a Dudley turbo 88

 

[ShaunCorbs]

Turbo or fluidmaster either is good normally fit a turbo on a big cistern and if space is limited then fluidmaster

 

[@TonyC]

I’ve given up considering the Turbo 88. I believe the siphons that I listed are more appropriate in the smaller, modern, lever operated cisterns. So, for Dudley, I am considering the Turbo Edge instead.

But the Macdee Motion siphon is interesting. The piston base has two hinged, solid plastic “flappers”. These replace the traditional, flexible diaphragm washer, which has a tendency to wear and split over time. Any feedback on this siphon would be appreciated.

 

[Ben-gee]

No real need to worry about a diaphragm splitting with a three part syphon, very easy/quick to replace.

 

[Ric2013]

To offer an alternative idea, I don't really see the advantage in a 3-part siphon.

WHY?

1. A diaphragm often lasts 20 years.
2. If the cistern is close-coupled type, then the metal plate under the cistern is generally in need of renewal by the time you dismantle to access the siphon, so that's a good opportunity to do it.
3. If the cistern is a high or low level type, it's really easy to remove the siphon, so a 3-part siphon is not particularly easier to service.
4. The diaphragm may be easy to access in a 3-part siphon, but you now have 2 extra seals that can fail compared with the normal 1-piece siphon that has no seals to fail.

Though I accept that, if you are unlucky, sod's law dictates the diaphagm will fail in 18 months and you'll wish you'd fitted the 3-part siphon.

 

[WC1]

"But the Macdee Motion siphon is interesting "

- Who comes up with the name "motion" for a toilet component?

 

[ShaunCorbs]

Rubbish had two break around 2 years in service