Hi, for some time our toilet has been hard to flush, it's a Dudley Turbo 88 syphon which when I removed I noticed the diaphragm was split and also the clear plastic stopper was missing. I cut some plastic sheeting I had to size to replace the diaphragm and cut a cork to shape to replace the missing bung. This had marginal success and I could flush it ok as I had the 'knack', but visitors and the kids still struggled. So I've just bought a new Dudley Turbo 88 and simply replaced the blue bit. Bingo. Easy to flush now. Except that it doesn't seem to be the most powerful flush in the world. The water cascades into the bowl ok, and for a fair amount of time, just not very powerfully. I noticed the instructions makes mention of 2 white plastic stoppers near the bottom of the unit, and says - "6 / 7 / 9L convertible 6L Nominal flush (cistern & WC pan installed from 1st Jan 2001) - remove upper white plug only 7L Nominal flush (cistern & WC pan installed after 1st Jan 1993) - remove lower white plug only 9L Nominal flush (WC pan installed before 1st Jan 1993) - leave both white plugs in place I have no idea whether ours is a 6,7 or 9L system. It was installed around 2000 so I'm guessing 7L. Anyway by default both white plugs were in so I tried removing the top one and then replacing it and removing the bottom one - couldn't really notice any difference at all in the flushes for each one. Can anybody advise if I should be doing anything else to make the flush a bit more powerful - I'm not after the Niagara Falls but a single piece of tissue paper can take a couple of flushes to get rid of, even though like I say plenty of water comes in, swirls around but just not very powerfully. Thanks in advance.