One jack wired parallel for extension phones, USOC wiring

Suttle wall-in-stall jacks provide an extra modular jack when installing a wall phone and features:
• Adapter easily installs over most wall phone jacks
• No new wiring or disassembly of the telephone is necessary
• Extra modular jack for connecting answering machines, recording devices, automatic dialer, and other phone accessories requiring a modular jack
• Equipped with mounting lugs
• UL certified