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Founded in 1941, Parco was the first manufacturer to specialize in O-rings, still their primary product. Their 154,000 square foot facility is one of the largest O-ring plants in the world. Parco also makes custom molded rubber products, including rubber-to-metal bonded parts, and they import and resell molded rubber seals. Parco makes high-performance seals. They are an industry leader in the development of proprietary rubber compounds and bonding techniques. Their seals are available in 340 compounds, more than 25 percent of which were introduced in the last five years.

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