Switchcraft #298. Modified 3-conductor 1/4" phone plug with coupling ring that can be threaded to thread projection of mating panel jack or to threaded end of the Lock-Extension Jax(R). Lock-Plug(R) makes proper contact to mating jack without tightening or attaching coupling ring, when rapid disconnect may be desired. Lock-Plug fits any standard jack with 3/8".-32 thread bushing with .094 inches of the bushing exposed.
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