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3M dual-walled polyolefin tubing with a special advanced adhesive sealant and an electro tin-plated copper core to prevent corrosion. MADE IN THE USA. These are not like imports with brass or tin cores that will break or loosen prematurely.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.