I need to find some flexi-pipe to go into my loft where the waste pipe goes. At the minute it isnt connected to the pipe running out of the roof so all the air is going into the loft and causing condensation which in this weather is quite bad and there is a lot of water up there. I need a piece of pipe which is 4.5" diameter at one end and 3.5" at the other and around 2 - 2 and a half feet in length when stretched. I have looked everywhere and cant find anywhere that sells anything like this. Does anybody have any ideas?