It is highly recommended to actually take your time and research micro liquid pump/micro diaphragm pump suppliers before making a final choice. Diaphragm pumps are most commonly used in heavy duty applications. They are not cheap at all. Basing your decision on guesswork is less likely to lead you in the right direction. Apart from researching suppliers, do pay special attention to their products too. It is imperative to get something that will raise to your necessities. Otherwise, the diaphragm pump will cause a lot of frustration. Fortunately, these models are widely available in numerous sizes, so finding the best model should be a matter of time only.