Hollands HFS-*D series high frequency splitters have been designed for residential and commercial applications. Features solder back design offering excellent EMI/RFI shielding, diode protected circuitry which passes DC power from any outputs to inputs, precision machine threaded F ports, and PCB design.
This device might be needed in a sophisticated and complex satellite distribution setup. With it, you can manually force an LNB to be left or right hand polarized. This task is normally performed by the receiver or multiswitch.