PVC stands for polyvinylchloride, it's a fairly light weight white plastic tube used in plumbing. It makes a useful core to boffers because it's very sturdy and light.
unplasticized polyvinyl chloride pipe. A semi-rigid plastic pipe in general use in irrigation systems.
Is white in color, is commonly used for irrigation mainlines and valve manifolds, and is more rigid than the black or brown poly pipe.