For cable surge protection you can install these on the main cable line coming into your home or at every cable device you have such as your cable modem and TVs. There will be some small loss through these devices but they will work.
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The other option is to use this device since it has more supression capacity but you need to be very careful replacing the gas discharge tube since you can push it into the barrel very easily. If you need to remove the gas tube from the unit, place the unit on a flat surface with the port facing up and be aware that it could possibly fall inside the unit.
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