Georg Fischer Type 561/562 Cone Check with flow-optimized check cone that provides for improved maintenance and reliability. The optimized flow geometry minimizes flow resistance and pressure loss. Thanks to the new sealing zone and specially developed profile seal, the valves are absolutely leak-proof. The new check valve Type 562 (horizontal) closes absolutely leak-tight with built-in 304SS spring. Higher grades of steel and coated springs are available. If no spring is desired, the Type 561(vertical only) is recommended, which is 100 percent leak-proof with six feet of water column. Sizes 1/2” to 4” feature a true union design. This allows for easy removal from a piping system without breaking down piping connections. Pressure rating of 150 psi @ 73°F (non-shock).