Killark 2HKB-B-GL - Compact round body instrument enclosures with threaded glass lens screw covers provide easy access to interior. High strength, lighter weight, corrosion resistant copper free cast aluminum construction. Glass lens made of tempered sode lime. Cover o-ring, Nitrile (BUNA-N) material, supplied standard supplied standard for a Type 4X rating. Cast mounting lugs are standard on all boxes. Internal ground screw supplied on all boxes. Electrostatically applied gray powder epoxy/polyester finish on exterior of box and covers. Offset feed-thru conduit openings (3/4” NPT) for maximum use of interior volume. Interior "X”-configuration mounting pad for instrument/device cast into the bottom of the box provided for flexibility. Covers have shrouded tamper resistant set screws as standard. Enclosures are explosion proof, dust/ignition proof, weather proof, and tamper resistant. HK Series boxes covers are cast from a copper-free aluminum alloy. Neoprene O-rings are provided with HK boxes to assure water resistance in NEMA 4/IP66 conditions.