How should a Promax 28 condensate pipe be connected to boiler ?The condensate pipe from the boiler is a black rubber tube which is PUSHED into 32mm WASTE PIPE and runs away into a soil pipe.Because the rubber condensate pipe is just pushed internally into the 32mm pipe and , there is no fitting to make a sealed joint.Is this safe? as I have just read that the condensate is part of the flue.