We are the only piston ring manufacturer serving the industrial marketplace with those quality certifications and a lean culture.

We understand that when you use our rings in a product you sell to your customers, we become an extension of your organization. And that is not something we take lightly. Grover's Milwaukee, Wisconsin manufacturing facility is one of a select group of companies worldwide that is certified for ISO/TS 16949, as is the Kennedale, Texas plant ISO 9001:2000 certified.