Amazon.com: Aluminum Weld On Vacuum Pipe Nipple Tube 16mm 2 Inch Length : Industrial & Scientific
Amazon.com: K & S 9317 Round Aluminum Tube, 7/16" OD x 0.035" Wall x 36" Long, 4 Pieces, Made in The USA : Industrial & Scientific
Amazon.com: ATEYC Aluminum Round Tube, Aluminum Hollow Tubing 5pcs Tube Connecting Shaft for RC Car Boat Model (Color : 6×3mm, Size : Length 100mm) : Industrial & Scientific
K&S Engineering 1110 Round Aluminum Tube, 5/32" OD x 0.014" Wall x 36" Long, 5 Pieces, Made in The USA: Metal Industrial Wall Tubing: Amazon.com: Industrial & Scientific