When sourcing 12V DC pumps for agricultural use, the most critical factors are Flow Rate (LPM/GPM) and Maximum Pressure (PSI). For spot spraying, a flow rate of 3.8 to 8.3 LPM (1.0 to 2.2 GPM) is usually sufficient, while boom spraying requires higher capacities. Ensure the pump features an automatic pressure switch that turns the motor off when the discharge is closed to prevent overheating. Additionally, verify the diaphragm material (e.g., Viton or Santoprene) to ensure chemical compatibility with the pesticides or fertilizers being used.