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Oil Free Piston Vacuum Pump Pm1400h. Oil-Free Design: Ensures clean air without oil mist contamination for labs and food industry. Thermal Protection: Built-in protection at 130 deg C prevents overheating and damage. Near Zero Maintenance: Durable construction with bonded piston rod and bearing assembly. Silent Operation: Equipped with shock mount and muffler for reduced noise levels. High Vacuum Capability: Achieves vacuum up to 29 inHg (31 mbar) for demanding applications. Dual Frequency Support: Compatible with 50Hz and 60Hz power supplies worldwide. Stainless Steel Components: Includes stainless steel gauges and needle valves for corrosion resistance. 2-Year Limited Warranty: Covers mechanical defects for peace of mind and reliability.