How to Seal Plastic Pipe Threads

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Plastic pipes require just as much maintenance and reinforcement as other galvanised piping. Sealing plastic pipe threads prevents leakage, contamination and friction that can result in an unstable piping system. Though TFE tape is normally an option as pipe sealant, it is not recommended for plastic applications since it can lead to over-tightening. A liquid or anaerobic sealant, also called a dope, provides a more durable and efficient bond between male and female plastic pipe threads.

Skill level:

Things you need

  • Pipe dope
  • Dry rag

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  1. 1

    Purchase a tube of pipe dope rated for plastic, or PVC (polyvinyl chloride) applications. It's essential that this is indicated on the product label.

  2. 2

    Ensure that both the male and female pipe threads are clean of any oil, grease or contaminants. Pipe dope works best when air has been eliminated from between the threads.

  3. 3

    Squeeze enough sealant to coat the first two threads of the male end, using a full 360-degree application.

  4. 4

    Align the female threads over the sealant and firmly connect the pipes. Use a dry rag to wipe away any excess pipe dope after assembly.

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