1. Manual operation, smooth movement, accurate and reliable positioning;2. Sliding column structure, good sealing, small size, light weight, easy to assemble and disassemble;3. The inner hole is processed with special technology, with low friction resistance and long service life: 4. No need for lubrication;5. Panel installation function, convenient and simple installation, meeting customer needs in many aspects. Category: Manual Valve, Brand: Airtac, Series: 4H