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The Apollo 62-100 Series is uniquely suited for applications in corrosive environments, including chemical processing, pulp and paper and other process industries. The rugged stainless steel body and RPTFE ball cone check provide reliable, patented protection against reverse flow. Unique Design (US Patent lb 4,172,465)Spring-Loaded For Fast Seating ActionCenter Guided - Radial Alignment Never NeededStraight-Through Flow Minimizes Pressure Loss