Cs3.1mm Silicone O Ring Od 78/79/80/81/82/85/87/88/90*3.1 Mm 30pcs O-ring Vmq Gasket Seal Thickness 3.1mm Oring White Red Rubber - Gaskets - AliExpress
O-RING KIT - Quantum Innovations
Ochoos 5 Pcs 85 mm Outside Dmr 3.5 mm Thick Rubber Rubber Oil Seal O Ring Seal Ring: Amazon.com: Industrial & Scientific