Chapin 4700 16 Ounce In - Line Fertilizing Injection System

Chapin 4700 16 Ounce In - Line Fertilizing Injection System

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Product Overview

The Chapin 4700 16 Ounce In-Line Fertilizing Injection System has a clear tank and a funnel-shaped head for easy monitoring and filling. The adjustable elbow connection allows it to be easily attached to any hose or spigot.  Ideal for liquid fertilizer, the in-line ferilizing injection system features HydroFeed technology and works differently than standard hose end sprayers.  Chemicals tend to have a higher density than water, causing them to sit in the bottom of the tank.  Rather than pulling chemical up and out and emptying the tank like a hose end sprayer, the injection system has an outlet tube that reaches all the way to the bottom of the tank, so that when water is added to the tank, it stays on top of the chemical mix, preventing the chemical from being diluted as it goes through the outlet tube. The tank will turn clear as the chemical runs out. 

Available sizes:

  • 16 oz. (4700)
  • 24 oz. (4701)
  • 32 oz (4702)
  • 1 gal. (4710)
  • 2 gal. (4720)

Features and Specs

For use in Lawns, gardens, and landscapes.
Dimensions 10.00 x 4.40 x 16.20
Tank Size (gal.) .125 gallons
Material / Construction Poly
Pressure (PSI) 40 PSI
Warranty One Year Limited Warranty
Shipping Weight 1.52 lbs
Manufacturer Chapin (Mfg. Number: 4700)
UPC 023883047009



  • Funnel-shaped head for easy filling and monitoring usage;
  • Adjustable connection elbow lets tank mount to any hose spigot;
  • Large opening with O-ring for leak-free operation.


  • Turn off the inlet water pressure.
  • Open the valve on the bottom of the chemical bowl to ensure the device is empty. Close the valve. Loosening of the top red plug will allow the unit to drain quicker.
  • For filling liquid fertilizer: Remove the red plug and slowly pour up to 16 ounces of product into the device. Re-install the red plug, tightening hand tight.
  • For filling graduated concentrate: Unscrew the clear bowl. Scoop desired amount into the the bowl, the re-install the bowl by screwing it on hand tight.
  • The injector is designed to work best with water flow rate above one gallon per minute. At 1 GPM or above, the device is designed to feed the liquid fertilizer at a rate of approximately 1 ounce of fertilizer per gallon of water flower.
  • For dilution rates less than one ounces per gallon, pre-mix the product prior to filling the bowl. Follow recommended dilution rates for the fertilizer being used.
  • Empty the tank and leave the bottom drain valve open when freezing conditions are present.
  • When watering without fertilizer, it is not necessary to disconnect this device.
  • The unit is provided with a filter in the chemical suction tube. periodic cleaning of the filter is recommended.

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