Also known as duct seal, or as some of us call it "donkey dick". Lowes/home
depot sells it as does any electrical supply house. By putting mostly
fiberglass insulation or steel wool in the pipe, you need less of the stuff.
73 bob de w9ge
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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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