I recently questioned why there was a difference between pvc pipe and pvc fence posts...i looked at a site called weatherables.com....their vinyl fence posts are definitely pvc. I e-mailed them and asked why there might be a difference and they didn't know. I thought that the difference might be in the manufacturing process...maybe there's more porosity in the pipe.
https://sites.google.com/site/mykr2stretch/ https://sites.google.com/site/mykr2stretch/parts-for-sale
