Amazon.com : Dosatron Inline Fertilizer, Insecticide, and Fungicide Injector for Irrigation and Hydroponic Systems - (Fixed Ratio 1:100) : Patio, Lawn & Garden
Chapin HydroFeed 16 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden Applications 4700 - The Home Depot
Ez-flo fertilizing system
Fertilizer Injectors for Gardens and Farms
Gardening Rhythms: Fertilizer Injectors - YouTube
EZ-Flo Fertilizer Injectors commercial models for Garden Drip Irrigation or Lawn Sprinklers inject any water soluble or liquid nutrient without pre-mixing.
How To Install The EZ-Flo Mainline Fertilizer Injector - YouTube