There is a standard UHF - N cap that is the same size and thread as the K3 mic connector.The number on it is "MX-913/U" and has part number"91836" (Probably an Amphenol number. Jim - W4RKS --------------------------- KC6CNN wrote: >I am looking for a cap of some sort that will screw on the >microphone connector on my K3 and my K2.