Plumbing & Pipe Repair Diagnostics

Why is purple primer commonly required before applying solvent cement on PVC pressure water lines?

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 Correct IncorrectPrimer chemically softens and etches the slick PVC surface, allowing the solvent cement to truly solvent-weld (fuse) the molecules of pipe and fitting into one piece.

Why is purple primer commonly required before applying solvent cement on PVC pressure water lines?

• To prevent tree roots from detecting water
• To act as glue by itself when dried
• To waterproof the joint against subterranean groundwater
• To soften the plastic for true solvent welding, with purple dye so inspectors can verify primer was used