uxcell Black PVC Tube Wire Harness Tubing, 3/16-inch(4.5mm) ID 10ft Sleeve for Wire Sheathing Wire Protection: Amazon.com: Industrial & Scientific
Eastwood Tubing Tube Bender Plumbing High Capacity Pipe Bender Machine 180 Degree Metric Rotary Draw Hand Bender - - Amazon.com
Imperial Tool 370FH Triple Head 180 Degree Tube Bender, 3/16”, 1/4”, 3/8”, and 1/2”: Amazon.com: Tools & Home Improvement
Amazon.com: 10 Feet - 3/8" ID 1/2" OD Clear Vinyl Tubing Food Grade Multipurpose Tube for Beer Line, Kegerator, Wine Making, Airline Tubing for Aquarium, Air Water Hose, Fuel Line by Proper