Good to know, about the 1/4 inch. Im thinking about next summer making 20 tub hatchling rack to use, but still up in the air about about which tub i want to go with(v-18/6qt/12 qt). I might go 1/2 inch since i might make it pretty tall and possible 3 wide, just have to find a local place that sell pvc:(. How heavy is it about empty?