Baxi 105e diverter valve?

u will have damaged the black rubber seal around the pipe or its worn. this seal is called an O Ring. u can get a universal pack from b and q or many boiler spares shops. normally it would have come with the diverter valve. just pull the pipe out replace the O Ring with a new matching one and reinsert and put the clip back on. take the O Ring with u so u can get a good match. also have u checked if u pushed the pipe in far enough into the diverter valve before refitting the clip

kash
October 2013