The Hy Power GU4-HF-1KW is a 4:1 Guanella Current HF Balun with an SO239 connector for coupling your coax and dual banana jacks for connecting parallel feeders.
These are very efficient baluns and maintains a low SWR curve over the entire HF frequency range when terminated into a 200 ohm matched load. It uses a single ferrite core and can handle 1000 watts continuous and up to 1500 watts peaks in a matched condition. These ratings are good up to a 2:1 SWR.
This balun is not waterproof and is not meant to be left in the outside elements uncovered. It can be used outside if placed inside of a waterproof enclosure. If this balun is used on an antenna, such as an antenna used for portable or field day operations, you must provide a means a strain relief. The connections on the balun are not strong enough to handle the mechanical stress from the antenna wires.