1. The external force required for reversal of S3B, S3R, S3L and S3V series is provided by an external mechanism and can be used for position detection or travel switch;2. S3PF, S3PM, S3PP, S3PL. S3Y, S3HS, S3C and S3D series are manually operated and have various structural shapes of control heads to facilitate use under different conditions;3. Cut-off structure, good sealing, flexible reversal, no need for lubrication;4. Multi-position installation, easy to install and use;5. S3C, S3D, S3Y, S3R and S3L series control heads are made of metal, with long life and more reliability and stability. Category: Mechanical Valve, Brand: Airtac, Series: S3V