Yosoo Dc 12v 80kpa Micro Piston Vacuum Pump Mini Pumping Air Pump Air Sampling Applications:widely used in instruments and equipment,medicine and chemical industry,home appliances and other fields if you use silicone tube:Inner diameter 3 MM diameter 6 mm if you use PVC hose:Inner diameter 4 MM diameter 6 mm Rated voltage:12V DC;Current rating:&lt;630mA;Degree of vacuum:-80Kpa(1Mpa=10Bar=1000Kpa) Pressure:0.1MKpa;Flow:20L/min;Noise:&lt;50 dB;Size:112*40*75mm