Originally invented by Anaconda in 1947, Sealtite® is the Trade name for flexible, liquid-tight conduit. It can be found in applications as mundane as an air conditioning whip all the way to nuclear power plants. In its many forms, it is essentially a flexible metal core (much like Greenfield) covered by a moisture resistant covering. The typical construction for general use in electrical construction is a crush resistant core made from high-grade galvanized steel with smooth bore for easy wire fishing. The PVC jacket covers the core to provide protection from moisture, dirt, and abrasion. This product can also be ordered in a low smoke, low toxic version for Transit Authority work.