1 Pint Fertilizer Injector

Economical, flexible and easy-to-use, the Add-It™ Automatic Proportional Fertilizer Injector with backflow device or without is ideal for residential, including feeding lawns, shrubs, trees, flowers, raised beds, vines and potted plants automatically without a pump, spreaders or hoses. The Add-It™ Automatic Proportional Fertilizer Injector with 1-pint capacity is designed to feed your garden plants using any liquid fertilizer nutrients or premixed liquid of water-soluble granular fertilizer through your drip irrigation system, sprinkler system or garden hose. The Add-It™ requires a minimum flow rate of 30 gallons per hour (½ GPM) or a minimum drip system with 30 drippers to operate.


  • An Economical way to apply nutrients
  • Simple and Easy to Install
  • Constructed of heavy-walled, UV-resistant, PVC without any moving parts for maintenance free operation
  • Work with any liquid or water-soluble dry fertilizers
  • No pump or outside power source is required
  • Apply fertilizer proportionately and evenly throughout a drip system or conventional sprinkler irrigation system with no pressure loss and without any moving parts
  • Ideal for residential, commercial, greenhouse and nurseries
  • The liquid fertilizer applied is absorbed easily by a plant’s root system
  • The Add-It® fertilizer injectors have received the prestigious AE50 award of recognition from the American Society of Agricultural Engineers for outstanding innovations in product design
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How Add-It™ Proportional Automatic Fertilizer Injectors Operate

The fertilizer additive is placed into the fertilizer injector tank. As the irrigation system operates, a small amount of water is diverted from the main line flowing through the fertilizer injector into the top of the tank by utilizing a specially designed. color-coded, flow controlled nozzle.
Since the specific gravity of the fertilizer solution in the bottom of the tank is greater than that of the added water, the water floats on top of the fertilizer solution and does not mix with it, so the concentration of the fertilizer solution remains the same from the beginning to the end of the cycle. The slight pressure differential created between the inlet and outlet draws the fertilizer solution from the bottom of the tank until all that is left in the tank is water.


1 Pint Fertilizer Injector
how to order
Model Description
AFI 5016-HV FHT x MHT with ¾” Backflow Device
AFI 5016-H FHT x MHT without ¾” Backflow Device


  • Operating pressure: 10 to 60 PSI (.7 to 4.2 BAR)
  • Minimum operating pressure: 10 PSI (.7 BAR)
  • Minimum flow rate: .5 GPM (2 L/M)
  • Sizes: 1 pint (.47 L)
  • Preset Ratio: 100:1, 100 parts water to 1-part additive
  • Temperature range: up to 130°F (54°C)
  • Inlet and outlet threads: FHT Inlet X MHT outlet or (FPT x MPT)
  • Material: PVC
  • Mounting position: Vertical
  • Colors:
    • Hose thread: Black body with blue caps
    • Pipe thread: Black body with gray caps
  • size: 4" W X 10" H (15.8 CM W X 25.4 CM H)

*Not recommended to be installed under constant line pressure.


Cut Sheets

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    Add-It Automatic Proportional Fertilizer Injector

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