From Amazon
Einhell Power X-Change 18V Clean Water Pump | Submersible Pump For Emptying Pools And Hot Tubs, Flat Suction Up To 1 mm, 4500 l/h, 0.8 Bar | GE-SP 18 LL Li Solo - Battery And Charger Not Included
Conrad Electronic
Einhell GE-SP 18 LL Li - Solo 4181560 Clean water submersible pump 4500 l/h 8 m