ProComm 12DMFPL Y Adapter for Dual CB Antenna Systems. ProComm Y Adapter for Dual CB Antenna Systems. The model 12DMFPL adapter will join two male Motorola plugs to a Single PL259 connector. Many Freightliner, Peterbilt, and Kenworth trucks have pre-installed dual CB antenna coax cables that end in Motorola connectors.
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