The QLF-2.5-50 from Qualwave is a Low Pass RF Filter with Frequency DC to 2.5 MHz, Stopband Frequency 5 to 50 MHz, Insertion Loss 0.8 dB, Upper Rejection 50 dB @ 5 to 50 MHz, VSWR 1.50:1. Tags: Module with Connector. More details for QLF-2.5-50 can be seen below.