The Primary Protector is environmentally sealed against the elements and will fit in any standard Subscriber Network Interface enclosure. This, in cooperation with the gel filled IDCs, protect against the risk of corrosion or failure caused by nicked wires during stripping. The GDT (Gas Discharge Tube) is widely accepted as the best in the industry and the addition of Comtest Networks Secondary Surge Protection guards the equipment in the house against lightning strikes and power crosses.