Circor International is one of the industry's leading manufacturers of Y-type, basket, duplex, fabricated and backwash strainers, butterfly and check valves for commercial and industrial water and wastewater treatment facilities worldwide. Circor products are use extensively for water and wastewater treatment by the chemical, petroleum, marine, pulp and paper industries and by steel mills, foundries and utility companies. The SSI Equipment, Spence Engineering, Leslie Controls and Nicholson Steam Trap divisions market valves and strainers to protect valuable industrial process equipment by filtering out materials from the fluid flow.