Hi. Looking for some hopefully very simply advice. I needed to replace a side entry flush valve on an enclosed toilet. I have installed the new flush valve but am having problems connecting it to the mains water supply pipe. The flush valve is 1/2" and pipe is threaded plastic. The mains supply has a corner fitting with a push valve, I think its 15mm. I am guessing I need some form of connector which will fit the mains push valve and also connect to the threaded flush valve pipe - but I just dont know what I actually need. Any help/advice would be really appreciated, thanks