uxcell Silicone Tubing 1/4"(6mm) ID X 3/8"(10mm) OD 10ft Silicone Rubber Tube Air Hose Water Pipe for Pump Transfer Black: Amazon.com: Industrial & Scientific
Amazon.com : SQXBK Bendable Bubble Wall 120cm/47inch Black Aquarium Air Curtain Bubble Air Diffuser Flexible Air Bubble Rubber Tube for Aquarium Fish Tank : Pet Supplies
BGS 6852 | Schrumpfschlauch-Box | Schwarz | Ø 8 mm | 5 m Heat Shrink Tubing Black Diameter - - Amazon.com