fishin4cars
True friends just call me Larkin
Bigger is better as long as the make up connections will adapt. as for the winter cracking I don't think you will have a problem if you are draining the lines before a freeze. I don't like the corrogated tubing, it costs more and it's a lot harder to get a good seal. I prefer schedule 40 PVC and cut it in to fit my applications if poosible. ti is ridgid and stiff but for me it makes a better seal and I bury anyway. As long as it's black or not able to allow the sun to penatrate any dark inside pipe will not clog as bad as the clear. You could always get a piece, cap one end, fill it with water cap the other end and place it in the freezer and freeze test it. Probably wouldn't cost but a little to make a test piece for peace of mind.