Features The ultra-quiet design does not produce too much noise, and the safe low voltage is adopted to ensure safety. The pump is small, lightweight, sturdy in structure, easy to install and maintain, and is an ideal substitute for the old pump. Built-in pressure switch and overflow valve to protect the pump from damage and control the normal operation of the pump. Made from engineering materials, it can withstand high temperature and corrosion, the flow rate can be 3L/min, and the service life is long. Suitable for gas pumping, sewage treatment, electroplating blasting, aeration of biogas tanks, ventilation of tunnels, etc. Functionality: 1. The ultra-quiet design does not produce too much noise, and the safe low voltage is adopted to ensure safety. 2. The pump is small in size, lightweight, sturdy structure, easy to install and maintain, and is an ideal substitute for the old pump. 3. Built-in pressure switch and overflow valve to protect the pump from damage and control the normal operation of the pump. 4. Made from engineering materials, it can withstand high temperature and corrosion, the flow rate can be 3L/min, and the service life is long. 5. Suitable for gas pumping, sewage treatment, electroplating blasting, aeration of biogas tanks, ventilation of tunnels, etc. Specification: Item type: micro-diaphragm pump Model: VN2709PM Material: Engineered plastic a>Supply voltage: DC6V Power: 3W Flow rate: 3L/min Negative pressure: -50KPa Medium: Air Noise: Package List 3 x Micro Diaphragm Pump