FESTO Pneumatic Valves Check valve 611027 - FESTO 193158, The FESTO Check Valve 193158 is a reliable component designed to control the direction of airflow in pneumatic systems. It features a 1/8" connection size and is compatible with 6mm tubing, ensuring seamless integration into existing setups. Typically used in automation and manufacturing processes, it prevents backflow and maintains system efficiency. FESTO 193158 GRLZ Check valve 1/8 QS-6-D 1pc