I have 3 Roca toilets with the center/top flush, which after the flush continue to leak water into the bowl, resulting in the cistern constantly re-filling is there a way to adjust this type of cistern ?

Joe Hackett, November 2007

You need to replace the flush-valve seal (Also known as dual flush valve washer, or diaphragm washer) at the bottom of the flush assembly.

How to do it :
http://www.lunns.net/cisternspares/roca_flushvalve_installation.pdf

Roca Part # :
8-22403000, about £1.53 + VAT from ROCA, £7.19 from Lunns (70122 - Roca Diaphragm Dual FV Washer)

happy flushing

Dave

Dave, November 2007