uxcell Black PVC Tube Wire Harness Tubing, 3/16-inch(4.5mm) ID 10ft Sleeve for Wire Sheathing Wire Protection: Amazon.com: Industrial & Scientific
Amazon.com: Ququyi PVC 5/8" ID x 7/8" OD Braided Clear Flexible PVC Tubing Soft for Four Seasons Vinky Tube, Reinforced Vinyl Hose for Water Discharge& Oil Transfer, 6.56ft : Automotive
Amazon.com : PENN-PLAX Standard Airline Tubing for Aquariums – Clear and Flexible – Resists Kinking – Safe for Freshwater and Saltwater Fish Tanks – 8 Feet : Aquarium Air Pump Accessories : Pet Supplies