Killark OLR-8 - Raintight when used with gasketed covers. - Malleable iron suitable for use in concrete. - Interchangeable with competitive products. - Stainless steel screws on stamped and cast covers. - Tapered threaded hubs (NPT). O series conduit bodies are our most compact conduits that apply highest durability with the securest installation. The O series is available in iron and aluminum, with superior corrosive protected electro-statically applied paint. Application: To provide access to conductors for pulling, splicing, and maintenance. Threaded for rigid conduit and IMC.