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Feature: Effective performance: Our check valves can effectively prevent countercurrent liquids for fluid system or backward flow of compressed air for pneumatic system. Versatile applications: These check valves are suitable for applying for automotive part, machinery industry, household appliances, agriculture and so on, a practical and necessary tool for you to choose. Specification: Material: PVDF Diameter: approx. 6.3 mm/ 1/4 inch Full length: approx. 38 mm/ 1.5 inches Color: white Package content: 6 x PVDF check valves Note: Manual measurement, please allow slight errors on size.