Self-priming and fast oiling. High hardness and wear resistance, high machining precision, good sealing performance and long service life. Product characteristics: Applicable ambient temperature is -20°C~40°C, liquid temperature: -5°C~80°C (high temperature above 80°C using special parts), low noise value: ≤60dB, internal relief valve can be installed. Can be used to transport operating oil, lubricating oil.