Sea Dog Terminal Block - 4 Terminals Sea Dog Terminal Blocks are modular, insulated, screw-type electrical connectors that are used to secure andor terminate two or more wires together. This block is useful for connecting wiring to a ground or for connecting electrical switches and outlets to the mains. Designed or use with tinned copper marine wire which shares the same expansion rate to prevent loosening wires and reducing electrolytic corrosion caused by pairing two disparate metals. Features