Below is a list of Rubber O-Rings manufacturers from Upland, California.

In general, rubber O-Rings are not made of natural rubber but of a variety of synthetic rubbers also known as elastomers. Popular elastomers used to make O-Rings include Viton, Kalrez, Neoprene, silicone, flourosilicone, nitrile, hydrogenated nitrile, polyurethane, ethylene-propylene (EPDM or EPR), silicone, and flourosilicone. Each type of rubber O-Ring has its own specific uses, based on its resistances to chemicals, pressure, and temperature.