10.5x2.7 Oring 10.5mm Id X 2.7mm Cs Nbr Nitrile Acrylonitrile Butadiene Sha 70 Black O Ring O-ring Sealing Rubber - Oil Seals & Other Seals - AliExpress
225 pcs Rubber O Ring O-Ring Washer Seals Watertightness Assortment Different Size with Plactic Box Kit: Amazon.com: Industrial & Scientific