The ALQP-43M43F-ER from L-COM is a RF Surge Protector with Frequency 555 to 4000 MHz, Input Power 200 W, Insertion Loss 0.1 dB, Operating Temperature -40 to 85 Degree C, Surge Current 50 kA. Tags: Quarter-Wave Shorting Stub (QWS). More details for ALQP-43M43F-ER can be seen below.