111675 Gardner Bender Inc OX-400N 4 OZ, Ox-Guard, Anti-Oxidant Compound, The Perfect Safeguard For Aluminum To Aluminum, Aluminum To Copper Wire Connectors Aluminum Conduit Joints, Guards Against Oxidation, Improves Conductivity, Penetrates Aluminum Oxide To Maintain Inter-Strand Inter-Conductor Current Paths, Produces A Cooler Connection.