I have used - with very good results, I might add - a product called "NOALOX", made by Ideal Industries, Inc. The web site is attached to this e-mail; search for Noalox. It is made for aluminum-to-aluminum connections in electrical boxes and it also works for aluminum to copper connections. 73, Gene, WØQFC Spring Hill, Florida WEB SITE: http://www.w0qfc.com