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20mm OD x 2m Seamless 316 Stainless Steel Tubing: Amazon.com: Industrial & Scientific
MECCANIXITY Acrylic Pipe Rigid Round Tube Blue 17mm ID 20mm OD 500mm(20") for Lamps and Lanterns,Water Cooling System: Amazon.com: Industrial & Scientific
Amazon.com: uxcell Silicone Tube 20mm ID X 26mm OD 3.3' Flexible Silicone Rubber Tubing Water Air Hose Pipe Translucent for Pump Transfer : Industrial & Scientific
Amazon.com: uxcell Silicone Tube 20mm ID x 25mm OD 1.64 Ft Flexible Silicone Rubber Tubing Water Air Hose Pipe Translucent for Water Transfer : Industrial & Scientific
Amazon.com: Stainless Steel Square Tubing Tube 20mm x 20mm x 1.5mm x 1310mm, 0.8" x 0.8" x 3/50" x 51.57" Long, 4 Pack 304 SS Square Tubings 1.5mm Thickness Polished Finished from