Oatey® Industrial Grade Purple Primer is an NSF-listed, aggressive primer for use on commercial and large diameter thermoplastic piping systems, specifically CPVC Sch. 40 / 80. It is formulated for use on PVC and CPVC pipe and fittings in cold weather applications. It removes contaminants such as surface dirt, grease and grime as well as softens the pipe surface to allow for a fast, secure solvent weld. This primer's purple tint provides visible verification that a primer has been used, which is ideal for areas where plumbing code require this proof. It also applies easily with included in-lid dauber. Oatey products have earned the trust of plumbing professionals for over 100 years.