Mitsumi R-14 A213 370 DC pump 6V 200mA Oxygen Pump Tank Sphygmomanometer Aquarium Oxygen Rinse Pump Low Noise Motor diameter: 24.3 MM (370 motor);Total height: 55.6 MM (motor + pump head) does not contain the gas nozzle; Outlet diameter: 4.1 MM; Voltage: 6 V;Current: 200mA; Weight:52g Note: the design has two kinds, the total length is slightly different, the difference is not big. it should be suitable for 3*5MM 4*6MM pipe, tube on this port is too loose, want to step up Used for for Fishing or Oxygen Tank or diy