I have an old bungalow, which has some old 3/4in pipe in places for the hot water feed, i am having to do some remedial work in the bathroom and it would be so handy if thee was a 3/4in to 22mm push fit connector, does one exist?. Otherwise will using a standard 22m push fit leak. Having done a test on an old piece of pipe it seems to lock ok into the fitting. But will it work under pressure?, I have a combi boiler by the way so the pressure is higher than tank fed hot water. at the moment have to make a 3/4 to 22 connection using 22mm straight couplings and a 3/4in olive , which i find tricky to seal. Any solutions to my ramblings?