uxcell Black PVC Tube Wire Harness Tubing, 3/16-inch(4.5mm) ID 23ft Sleeve for Wire Sheathing Wire Protection: Amazon.com: Industrial & Scientific
Amazon.com: HydroMaxx 25 Feet x 2 Inch Black Flexible PVC Pipe, Hose and Tubing for Koi Ponds, Irrigation and Water Gardens. Includes Free 4oz Can of Hot Blue Gorilla PVC Glue! :
Amazon.com: Clear Vinyl Tubing, 3/8" ID x 1/2" OD x 100' : Industrial & Scientific
Amazon.com: 1 Foot Long plastic plexiglass tubes, Clear acrylic PVC pipe transparent for 3 inch PVC fittings, 3 1/2 inch 89mm diameter tube, 1/10 inch thick tubing : Industrial & Scientific
Amazon.com: Clear Vinyl Tubing, 1/4" ID x 3/8" OD x 250' : Industrial & Scientific