Amazon.com: AC PERFORMANCE 102mm(4") OD, Length 11.8" (300mm), Straight 4 Inch 6061 Aluminum Pipe Tube Intercooler Pipe High Class Brushed Treatment Air Intake Tube : Automotive
Amazon.com: Aluminum Round Tubing - 1/2" OD x .050" x 48" Long : Industrial & Scientific
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
uxcell 6063 Aluminum Round Tube, 300mm Length 13mm OD 10mm Inner Dia Seamless Aluminum Straight Tubing: Amazon.com: Industrial & Scientific
80/20 Inc, 9701, 1.5" x 1.5" RT Square Tube with Holes x 24": Amazon.com: Industrial & Scientific