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K & S 1115 Round Aluminum Tube, 5/16" OD x 0.014" Wall x 36" Long, 4 Pieces, Made in The USA: Metal Industrial Wall Tubing: Amazon.com: Industrial & Scientific
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Blue Demon BDTP-125-01T Triple Play Low Temp Aluminum-Zinc Brazing Rod 1/8" x 18" 1 Lb Tube, - - Amazon.com