Installed on a vertical conduit, usually outdoors, to receive open wires from an electrical service line. Sometimes called a weather head, it prevents rainwater from entering the conduit. Multiple knockouts for wire size options, easy to install. Constructed from rigid PVC, non-conductive, corrosion-resistant and UV resistant. This 1 in. trade size cap is UL and CSA listed for use with Schedule 40 and 80 conduit.