... international standardsQuestions1. If I am not very understand how to choose the chemical pump, what you can ... for me?If you are not very understand how to choose the chemical pump, you can set ... us, like: Power, Voltage, Head, Flow Rates, In/Out Size, Motor Speed, Required NPSH and so on, ... : This product machine seals has two kind of designs: Built-in machine seals/outside installs equipment seals.1 ...