American Fittings AH300B Grounding Insulated Rigid Conduit Hub

American Fittings AH300B is a 3-inch, threaded, water-tight rigid conduit hub manufactured in the USA from steel, designed to join rigid conduit to an electrical enclosure while providing a weather-resistant seal at the connection. This catalog number sits in American Fittings' AH series of grounding hubs; the 3" size denotes the hub itself and it uses standard threaded connections compatible with rigid conduit and locknuts. Variants in the AH300B family include ground-focused configurations such as AH300BGL (3" hub with a lay-in ground lug) and AH300BGLAL (3" hub with grounding options), illustrating the range of grounding accessories available for this model. For grounding continuity, the manufacturer notes that employing grounding hardware with threaded hubs—such as grounding locknuts—helps establish a reliable ground path; AH300B hubs are described as water-tight steel components made in the USA. Typical applications include terminating rigid conduit at electrical enclosures, especially in locations where a weatherproof, threaded hub is required and where grounding hardware is used to maintain a proper electrical ground.