If you are trying to link several line cords together, or extending existing modular cable runs, Kong Cables's In-line Modular Couplers can help you make the right connection. The in-line coupler provides a female-to-female feed-through connection for easy cable hook-up. Connectors: One RJ-11 Female to One RJ-11 Female. Type: Straight Through RJ-11. Designed For: Data/Voice Applications. Use: Extends the length of two modular cables.