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 10mm OD 5mm Inner Dia 250mm Length Pipe Tubing 2 Pcs: Amazon.com: Industrial & Scientific
RDEXP Aluminum Alloy 3 Way L Shape Square Tube Clamp Tube Connector Pipe Fittings - - Amazon.com
Tubing, 0.18 in. ID, 1/4 in. OD, Aluminum: Amazon.com: Industrial & Scientific