I went to LOWES the other night to get a 50 foot roll of copper to make a chiller. I looked around and came across the refrigerator lines that are 3/8 " rather than buying a 50' roll and having to coil it from each end, I bought two 20' rolls and tightened the coils just a little....and then used a 1/4" connector to hook em together at the bottom then interlaced the coils. easy as pie.. It is not finished yet as I need some connectore for the water lines but I thought it went together very easily. oh yeah the rolls were only 16 or 18 bucks each.