PVC conduit routes and protects wire and cable in both indoor and outdoor applications, including direct-burial applications. It's lightweight and rust- and corrosion-resistant. PVC conduit can be heated with special tools so that it can be bent in the field and adapt to curves and changes in direction. Fittings join pieces of conduit together or join them to enclosures and devices. They're welded on with a solvent for a quick, liquid-tight seal.