Polyvinyl chloride (PVC) piping is acceptable for use in drain waste vent plumbing, and it’s use in these systems is widespread. One of the reasons for that is it is relatively inexpensive, lightweight and easy to join with simple tools. PVC pipe is joined together with PVC fittings using cement. Before the cement is applied a special primer is brushed onto the surfaces to be joined.
The rigidity and toughness of the type of polyvinyl chloride used in PVC piping requires treatment by a primer, which softens the material in order to improve the adhesion of the cement bond. It also cleans the pipe of grease and dirt.