Hi guys just had a boiler installed by a corgi plumber but im not so sure he has fitted the Pressure relief pipe and the condensate pipe properly, they are both fitted to the waste under the sink before the waste trap, I was under the impression that the pressure relief pipe should vent to the outside and that the condensate pipe can go to the waste pipe under the sink but join after the trap. am i right ? cheers guys and have a good new year Regards Cris