Hi Sam, I use to use the flexible grey corrugated tubing but as this didnt always empty properly have now upgraded to the white polypipe 32mm tubing you can get from any diy store. I bought about 3 2.1m lengths and a load of fittings like elbows, straights and 132 degree angles I bought about half dozen of each, this sounds a lot but believe you will need them, then when on site just use an hacksaw to cut to size and join together, the way i support the pipe from the caravan outlet is by using adjustable Velcro staps which fit in the lower awning rail to get the fall right towards the pitch drain, I made mine but now you can purchase online, just on other tip if you cut about 100mm of the grey flexible tube this fits nicely the 32mm elbow and the other onto the caravan outlets. hope this is of some help. Steve