I took the precaution of having tank heaters and insulation installed when purchasing our vehicle. Subsequently I insulated the drinking water tank drain pipe which was surprisingly omitted. During the recent cold spell we had temps down to -6 on our last two nights. On the last night both drinking water and grey water drain pipes froze. As we were going back into storage I had to drain both tanks and spent time underneath with a hair dryer so we could get on our way. I now realise I need to insulate the 28 mm pipe from the grey water tank. However, I cant think of any way to insulate the small plastic drain down taps. has anyone any ideas please? I realise that those nights were the coldest of the year and it's not an every day problem!