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T&B® Fittings Non-Metallic Expansion/Deflection Couplings provide flexible connections of PVC and fiberglass conduit runs that resist moisture ingress and stress caused by movement at structural joints. They safely accommodate axial or parallel movement of up to ¾ inch, and angular deflection up to 30 degrees from the relaxed position. The couplings may be used indoors or outdoors, for direct burial or embedded in concrete, and where a raceway crosses a structural joint intended for expansion, contraction or deflection in buildings, bridges, parking garages, piers, hospitals, and water and waste water treatment plants. They are NEC® compliant and UL® approved.