Milwaukee M18 18-Volt 4 Gal. Lithium-Ion Cordless Switch Tank Backpack Pesticide Sprayer (Tool-Only) and 3 Tank Assemblies 2820-20PS-49-16-28PS-49-16-28PS - The Home Depot
Milwaukee M18 BPFPH-0 18V Li-Ion RedLithium Cordless Switch Tank Back Pack Fluid Pump Harness - Bare - Screwfix
Milwaukee M18 18-Volt 4 Gal. Lithium-Ion Cordless Switch Tank Backpack Pesticide Sprayer (3-Tool) 2820-20PS-2820-20PS-2820-20PS - The Home Depot