Modular Line Cords
Telephony Accessories: Couplers and cords.
Telephony Couplers
P/N: 135-0314 - 159MC-4 - 4-conductor coupler
Inside Dimensions: N/A x N/A x N/A
The modular coupler may be used as an in-line device for connecting and/or extending two modular plug-ended line cords. Extends modular circuits without ...
https://primex.com/products/telephony-couplers/
Modular Line Cords
P/N: 135-0318 - 7200-07-W - 7ft, silver
Inside Dimensions: N/A x N/A x N/A
These flat modular line cords feature RJ-11 jacks, come in a variety of lengths, and are designed to be compatible with most telephony applications.
https://primex.com/products/modular-line-cords/