New syphon for push button toilet

I am going to look at a toilet that is constantly running into the bowl , not sure of the make as I havent been yet , but it is a 5 yr old twin flush toilet with the button to flush it attached through the cistern lid to the syphon , If I have to replace the syphon where is the best place to get one from as it will be specific to the make of toilet???? Cheers Guys. ps what was wrong with the old universal syphon !!!!!!!

If you can't get a like for like replacement. You might want to try and get one like this:
Wirquin MVB3

Wirquin homepage

I've seen some of the Wirquin syphons in B&Q, but whether or not they do that model I don't know.

they are not syphons, just a flap over a hole. some one i know has one, and it does just as you say, often its the release jammed, a quick press of the button and it releases the release. i am not saying this will solve your problem but it does his and they are also very unreliable