Micro Couplers are used to join two segments of MicroDucts. Straight and Transition couplers are available. Easy assembly/disassembly, no tools required. Provide an air- and water-tight connection. Color coded by size. Tested to meet or exceed the stringent requirements of CENELEC EN 50411-2-8:2009 Standard for MicroDuct Connectors, for Air Blown Optical Fibers. Low profile design. Approved for use at 232PSI/16Bar."HD" or"Heavy Duty" denotes enhanced pull-out and pressure characteristics.