Davey D75GA Cast Iron Rubber Cushion Mounted Submersible Grinder Pump for Black Water with Open Impeller

Designed for unattended service in domestic septic systems, the Davey D75GA provides fully automatic grinding performance to protect residential infrastructure from sewage backup. This automatic model features an integrated float switch that triggers the shredding cycle as water levels rise in the pit. The system is ideal for pumping grey and black water to pressure sewer mains, utilizing a high-torque motor to process soft organic solids and textiles. Its cast iron and stainless steel construction ensures it remains stable in harsh sub-surface environments.

Powered by a 0.75 kW single-phase 240v motor, this model achieves a maximum head of 18.5 metres and a maximum flow rate of 150 L/Min. The unit operates with a rated current of 7.5 Amps, providing the necessary torque to drive the high chromium steel shredder ring through tough debris. This electrical configuration is optimized for domestic power supplies while delivering commercial-grade hydraulic pressure. The automatic operation ensures that sump levels are maintained without the need for constant manual monitoring.

The hydraulic heart of the assembly utilizes an open centrifugal impeller paired with a shredding ring to handle liquids containing up to 20% soft organic solids. This design facilitates the passage of macerated slurry through small-bore discharge pipes, making it suitable for modern septic effluent disposal. By utilizing high-grade cast iron for the pump casing and impeller, the unit resists the abrasive wear typically associated with pumping waste water. The centrifugal flow path ensures silent and efficient operation during every cycle.

Structural longevity is provided by a 304 stainless steel motor shell and heavy-duty powder-coated cast iron pump components. The motor is shielded by a double mechanical shaft seal and a sand slinger lip seal to prevent moisture and abrasive particles from entering the electrical chamber. For enhanced security, the unit is fitted with an internal thermal overload and a 10-metre HO7RN-F oil-resistant power lead. The integrated handle and stable mounting feet allow for rapid installation and easy maintenance in deep sumps.

FEATURES

• Preset length float switch enables fully automatic operation for unattended sewage and sump control.
• High chromium steel shredder ring and grinding ring effectively process textiles and soft organic solids.
• Open centrifugal impeller design allows for the passage of solids in suspension without internal clogging.
• Double mechanical shaft seal in an oil bath provides professional-grade protection for the 0.75 kW motor.
• Heavy-duty powder-coated cast iron pump parts ensure durability in aggressive septic environments.
• HO7RN-F 10 metre oil-resistant power lead ensures a safe and durable connection to the power supply.
• Automatic resetting thermal overload prevents motor failure during high-load shredding cycles.