Home Distiller

I know Lowes says on there website you can get 2inch copper pipe from them but it says for this pipe not to exceed 100 degrees while then 1 inch pipe can go to like 350 degree F. If I can't get 2 inch can I then at least get a 2 inch to 1 inch reducer?? I ask because if I buy the keg clamp and all that mile high distilling sells for there kegs at least I can go with 1 inch pipe instead of 2. I've been told though 2 inch is better. So is the 2 inch pipe lowes sells safe to make a still with??

Thanks
Chris