Fernco 8" x 8" Flexible Coupling (Concrete to Concrete) Part No. 1004-88 Dimensions: 10.38" x 10.38" x 5.90" Used for all types of in-house and sewer connections: drain, waste, vent piping, house-to-main, repairs, cut- ins, conductor, roof drains and increasers-reducers. Dimensions: A - 10.38"/264mm B - 10.38"/264mm C - 5.90"/150mm Made of tough elastomeric polyvinyl chloride (PVC), they are strong, resilient and unaffected by soil conditions. They are also resistant to chemicals, ultraviolet rays, fungus growth, and normal sewer gases due to the inert nature and physical properties of the material. And they're leak-proof, root-proof and seal against infiltration and exfiltration.