Airtight plugs are installed in the end of large sizes of PVC conduit during bending to____________.

Airtight plugs are installed in the end of large sizes of PVC conduit during bending primarily to prevent the conduit from wrinkling or flattening. When PVC conduit is bent, the material is subjected to stress and deformation. By sealing the ends of the conduit with airtight plugs, it helps maintain the internal shape and structure of the conduit, ensuring that it bends smoothly without collapsing. This practice is particularly important for larger sizes of conduit where maintaining structural integrity is essential for both functionality and appearance.

While other reasons such as preventing condensation or controlling gas emissions can be relevant in certain contexts, the specific purpose of using plugs during the bending process focuses on preserving the conduit’s shape and preventing damage that could occur from improper bending techniques.