Watertight hubs securely connect Rigid or IMC conduits to standard knockouts in boxes or electrical enclosures G&S SUPPLY corrosion resistant zinc die cast construction prevents moisture, dust and other damaging particles entering conduit. Oversized locknut prevents damage from vibrations. UL listed, NEMA 2, 3R, 4, 4X, 5, 12, 13 approved; 1/2” to 4” sizes to suit multiple applications are always in stock.