The 4123A from Inmet by Spectrum Control is a Power Divider with Frequency 1.09 to 1.09 GHz, Insertion Loss 0.5 dB, Isolation 20 dB, Input Power 5 W, Amplitude Balance 0.5 dB. Tags: Module with Connectors, Wilkinson Power Divider. More details for 4123A can be seen below.