The self-priming pump is a low-pressure pump, designed for a wide range of uses, applicable for pumping polluted sewage water with self-priming ability of a depth up to 6 meters. The application of this pump is mainly for service work in fields, construction and agriculture, drainage, pumping and irrigation. The specific density of pumped water is up to 1 050kg/m3 and 3% of the weight of solid mechanical addition. The maximum temperature is up to 40°C and acidity 6 – 7,5pH.