Nitrile (nbr) 70 Id X Cs Mm Metric Sizes Oring Cs =1 Mm O-ring Seals Buna N 70 Rubber Gasket - Gaskets - AliExpress
W607A Special Japanese Mini O Ring Kit Waterproof Crown Gasket 39 Assorted Sizes 1.9mm to 7.0m for Watches Repair - AliExpress
End Caps and Flange Caps for Subsea Watertight Enclosures
770pcs Rubber O Ring Assortment Kits 18 Sizes Sealing Gasket Washers Made of NBR by HongWay for Car Auto Vehicle Repair, Professional Plumbing, Air or Gas Connections: Amazon.com: Industrial & Scientific