uxcell Fluorine Rubber O-Rings, 4mm OD 1mm ID 1.5mm Width FKM Seal Gasket for Machinery Plumbing, Green, Pack of 20: Amazon.com: Industrial & Scientific
Metric Nitrile Rubber NBR O Ring Seals 1.5mm Cross Section 2mm-19mm Internal Dim | eBay
O-Rings Nitrile Rubber 36mm x 39mm x 1.5mm Seal Rings Sealing Gasket 50pcs - Walmart.com
American Standard 9 mm x 1.5 mm O-Ring for Handle 912711-0070A - The Home Depot