Spacious and flowing, with good performance. When pumping mud and impurities, there is minimal wear on the pump The head and flow can be infinitely adjusted through the opening of the air valve Due to the diaphragm completely separating the conveyed medium from the moving parts of the pump, the medium will not leak outward No need to use electricity. Safe and reliable use in flammable and explosive places. Can work submerged in a medium, Manufacturer: ZXZZAS