UNILETS® Flexible coupling with female end fitting with union at one end and a female end fitting with a removable male nipple at the other end. Explosion proof, dust-ignition proof, watertight. Smooth, rounded integral bushing in each hub protects conductor insulation. Accurately tapped, tapered threads for tight, rigid joints and ground continuity. Heavy duty design resists mechanical abuse. Electrical conductivity equal to rigid conduit on a similar length basis, no bonding jumper required. Interior insulating liner protects conductors from abrasion under vibrating conditions.