The strong outer housing protects the pump from becoming easily damaged2) A thick rubber gasket separates the two halves of the air pump, reducing noise and preventing vibration3) The wide, flat shape base of the pump makes it stable and easy to place4) The integrated rubber feet prevents noise and vibration keeping the pump stable so there is no movement from its intended position5) The replaceable diaphragm and assembly cartridge makes this pump simple and inexpensive to service