Bayite BYT-7A014A DC 12V Solar Hot Water Heater Circulation Pump with DC Power S
1/2" Male thread on the pump. The OD of the brass coupler is 10mm. Plug type: 2.1mm x 5.5mm female. Circulation pump is non-self-priming pump. Power Source 12V DC Power Source. Style hot water pump with power adapter.