PVC gasketed pipe

Uni-Bell PVC Pipe Association, gasketed PVC pipe has a factory-installed rubber ring joint. This locked-in-place design prevents fishmouthing or accidental dislocation of the sealing gasket when pipe spigots are inserted in the bell joint. Do not attempt to remove the gasket from the gasket groove.

https://www.uni-bell.org/Portals/0/ResourceFile/pvc-pipe-gasketed-joints-part-1-history.pdf

Clipped from: web site