Amazon.com: uxcell Nitrile Rubber O-Rings 20mm OD 16mm ID 2mm Width, Metric Buna-N Sealing Gasket, Pack of 50 : Industrial & Scientific
Amazon.com: uxcell Nitrile Rubber O-Rings, 5mm OD 2mm ID 1.5mm Width, Metric Buna-N Sealing Gasket, Pack of 20 : Industrial & Scientific
Amazon.co.jp: DINGGUANGHE CS1.2mm Silicone O-Ring OD 16/19/18/20/22x1.2mm Japanese VMQ Gasket Seal Thickness 100PCS White Red Rubber 1.2mm Logical Gasket, Ring (Size : OD18x1.2mm Red) : Industrial & Scientific
uxcell Nitrile Rubber O-Rings 8mm OD 4mm ID 2mm Width, Metric Sealing Gasket, Pack of 200 : Amazon.ca: Industrial & Scientific