Wall duct is a UL® Listed, metal raceway used to enclose the wiring to diagnosticimaging machines. Wall duct is used in combination with trench duct to provide a complete raceway system from the power and control consoles to the patient table. The raceway system enables a complete lay-in system. Cables can be installed by removing all covers and laying in the conductors. This is 18 inches coupling device attached to one end.