Topaz’s Water Tight Conduit Hub with Insulated Throats are used to secure or terminate threaded conduit to an unthreaded opening in a box or metal enclosure where a rain-tight, oil-tight or dust-tight connection is required. Insulated throat insulates conductors, prevents abrasion and thinning of conductor insulation, and reduces wire pull effort. Oversized locknut protects against damage from vibrations and promotes positive grounding. The threaded portion of the hub positions into a knockout and is locked in place with a locknut. Once in place, conduit can be threaded onto the hub. Hubs form a watertight seal, making them ideal for indoor and outdoor applications, including service entrance applications. All malleable construction ensures mechanical protection. Zinc-electroplated for added corrosion protection.