What should be done to prevent PVC conduit from wrinkling during bending?

Using airtight plugs in the ends of PVC conduit helps to maintain pressure within the conduit during bending, which significantly reduces the risk of wrinkling. When bending PVC, especially at sharp angles, the material can become susceptible to deformation. By sealing the ends, you ensure that any air trapped inside can help support the walls of the conduit, thus maintaining its shape and integrity while allowing for a smoother bend.

Employing tools like a bending machine or heating the conduit could facilitate better bends, but they do not specifically address the issue of wrinkling. Smaller diameter conduit may bend more easily, but it also does not inherently prevent wrinkling issues. Therefore, sealing the ends with airtight plugs is an effective method to preserve the shape of the PVC conduit during the bending process.