Attributes . Includes insulated throat, external grounding lug; Unique long ferrule with more pronounced threads provides over four times UL pull-out requirements; Ferrule provides maximum surface contact for better sealing and a continuous, permanent, positive metal-to-metal ground; Adequately sized bonded lugs provide excellent grounding continuity and allow for visible ground path inspection; Suitable for outdoor use; Full, machined tapered threads (NPT) . Names