COMET CF-706A Duplexer 

HF-6M / 75MHz-550MHz Duplexer for the IC-706/MKII/G FT-100, etc...
Band Pass         Ins. Loss          Max Power
1.3-57MHz      0.4dB               350w PEP
75-550MHz     0.4dB               350w PEP
Isolation: More than 40dB
CONNECTORS:
Output:            Low In:            High In:
SO-239           PL-259            PL -259