75 Ohm F Terminator=4-Pack for Cable TV Connections

"Terminators are necessary for use on open splitter or amplifier ports to prevent ghosting and other undesirable TV signal problems. When connections are left open, strong signals can reflect back through cabling system, causing ghosts in your TV picture.Open connections can also cause undesired visits from the cable company, since your cable signal can broadcast out through open connections and interfere with radio communications outside your home."