Amazon.com: Acrylic Rigid Square Tube, Clear, 2-1/4" ID x 2-1/2" OD x 12" L - Pack of 2 : Industrial & Scientific
uxcell 18FT 10mm Inner Dia Clear Plastic PVC Hose Pipe Tube for Air Pump - - Amazon.com
Amazon.com: MYCZLQL 3pcs O. D Transparent Acrylic Aquarium Fish Tank Pipe Plexiglass Water Supply Tube, for Garden DIY Irrigation Fittings 32CM(16~90mm) (Size : Outer Dia 75mm) : Tools & Home Improvement
Small Parts - TPC-125/16-24 -TPC-125/16 Polycarbonate Tubing, 3/4" ID x 1" OD x 1/8" Wall, Clear Color 24" L: Industrial Plastic Tubing: Amazon.com: Industrial & Scientific
Amazon.com : Source One Deluxe Clear Acrylic Tube 3 Inches Thick (12 Inch, 3 Inch Wide) : Office Products
Amazon.com: 4 inch Long 5 Piece Pyrex Glass Tubes 12 mm OD 1.5 mm Thick Wall Tubing Borosilicate Blowing Tubes : Industrial & Scientific