Syphon size

Capybara84

Hi. I have removed cistern and syphon in a closed loop. All nuts bolts etc are rust free. Syphon is 11 inch and 7ltrs. For a single flush lever toilet. Do I need to replace the syphon (which is knackered) with like for like or would a 9 inch etc work. Reason is, it seems much trickier to get hold of 11 inch compared to shorter heights. Thanks in advance 

Rodders53

1.  Have you measured it right? 
https://www.toiletspareparts.com/blogs/news/how-to-know-the-size-of-your-syphon-siphon

2.  Amazon and other online places sell em.  Any decent Plumbing place will, too (not the diy sheds).   Expensive though.

A different size (height) will (obviously) have smaller fluid flush as a result of the lower water level possible in the cistern... It may make it poor flush as a result...  The fill valve will need level adjustment to work and not overflow.

Consider a push-button flush valve replacement to the syphon instead?  (e.g. Flomasta https://www.screwfix.com/p/flomasta-kf700-1-dual-flush-valve/712gf ).

PS I assume 'closed loop' is meant to read 'close-coupled'

Capybara84

Hi, thanks. Yes close-coupled!
It says 11" and 7ltr on the old syphon.
Thanks for the information, much appreciated. 

nofoollikeold

Get a Dudley Turbo88 adjustable height one.  Adjust to fit just under cistern lid.  Added advantage - you can change the syphon  diaphragm washer without removing the cistern on a low level close coupled.