FAQ: What are the benefits of the Champion Fiberglass Interference Joint?
The Interference Joint system consists of an integral bell and a spigot with a buttress-type male thread, with the belled end containing the mating female threads. These can be joined together to form a concrete-tight connection without epoxy for quick and easy concrete embedment application installations. (This system is available exclusively from Champion Fiberglass.) Read more about this and other types of Champion Fiberglass joints in our Champion Duct® catalog.