Brand: Tripp-Lite. MPN: N033-001. Tripp-Lite straight through modular in-line coupler telephone rj45 f/f Tripp-Lite's rj45 straight inline coupler provides a female-to-female feed-through connection. It allows you to extend the length of an rj45 patch cable by adding on another rj45 patch cable. This coupler is not cat5/cat5e rated - for use with telephone type applications. For cat5/cat5e rated couplers, see Tripp-Lite n032-001.