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uxcell Silicone Tubing 3/16"(5mm) ID x 5/16"(8mm) OD 3.3ft(1m) Silicone Rubber Tube Air Hose Pipe for Pump Transfer Clear: Amazon.com: Industrial & Scientific
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Silicone Tubing for Peristaltic Liquid Pump - 1 Meter : ID 3659 : $3.50 : Adafruit Industries, Unique & fun DIY electronics and kits