A 4 in 1 output switch controlled by DiSEqC equipped receivers. A typical application is for the selection between 4 universal LNBs, where the 22KHz tone is used for LNB band selection.
It is housed in a weatherproof case, which completely covers the connectors which obviates the need for self amalgamating tape or rubber boots.

The DiSEqC 4x1 has 2 integrated 1.5m long cables and is easily attached to the dish via a cable tie (supplied).