The FNP-1237 from Filtronetics is a RF Duplexer with Frequency 451.75 to 467.25 MHz, Band 1 451.75 to 457.25 MHz, Band 2 461.75 to 467.25 MHz, Power 10 W, Insertion Loss 1.6 dB. Tags: Module with Connectors. More details for FNP-1237 can be seen below.