bayite BYT-7A014 DC 12V Solar Hot Water Heater Circulation Pump Low Noise 3M Discharge Head 2.1GPM Circulation pump is non-self-priming pump. Max Flow Rate: 2.1GPM, Max Discharge Head: 9.8ft. Max system pressure: 10Bar(145PSI) . This doesn't mean the pump produces 145PSI. It means the pump can be connected to the system less than 145PSI pressure 1/2" Male thread on the pump. The OD of the brass coupler is 10mm. Plug type: 2.1mm x 5.5mm female. NO POWER ADAPTER INCLUDED Power source: DC 12V(NOT INCLUDED), Rated current: 0.7A, Brushless Motor, Low noise: 30db at 1 metre, Service life: 30000 hours. Please note: If you use this pump for circulating wort it should be cleaned out after using it Max circulating water temperature: 55C/131F. It's submersible but can't be immersed in hot water exceeding 50C/122 One year warranty: replacement without return