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Flexible Couplings consist of a lenght of flexible PVC pipe with a coupling glued to each end. The overall length is 18 inches, rated for 150 psi maximum. They are great for going around odd corners, repairing breaks in pipe, or for routing a pipeline around tree roots or other obstacles. They are designed to be buried underground. Not for hot water or potable water, and not to be used in constant pressure applications.