In-Line Fertilizer Dispensers for Garden Hoses
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An in-line fertilizer dispenser sits on a garden hose and adds fertilizer to the water as it flows, so you do not mix a separate bucket. If you already have a hose and a spigot, the question is which unit fits your setup and how much product each tank holds. This guide compares six units that a shopper can find on Amazon for this job. Every spec comes from the listing, checked on 2026-10-17. Where a listing gives no number, the table says so. No prices or ratings are listed, because Amazon prices change often.
Quick answer
For a tank that mixes inside the hose line, the Chapin HydroFeed range is the main group here: a 16 oz tank with an elbow mount to the spigot, 24 oz and 32 oz tanks with a built-in bracket, and 1 gallon and 2 gallon tanks with a variable rate of 1 to 10 oz per gallon. For a unit that screws onto the end of the hose, the Chapin G405 is the one listing in this set. The 1 gallon and 2 gallon units are the only ones whose listings state a rate range. If you need that setting, start there.
How we chose
We kept listings that describe a unit fitted to a garden hose or hose spigot and that feed fertilizer into the water. We left out a faucet-only injector, a drip irrigation kit with BSP connections, and a small bottle on a hose adapter. The listings do not state flow rates in gallons per minute, so flow is not compared here. This guide does not state a fertilizer safety rule, because no fertilizer label was opened for it. Read the label on your own fertilizer before you mix.
Comparison
| Product (ASIN) | Capacity | Mounting | Rate setting | Opening |
|---|---|---|---|---|
| Chapin 4700, 16 oz (B07D9T33BC) | 16 oz | Adjustable elbow to hose spigot | Not stated | Not stated |
| Chapin 4701, 24 oz (B07D9T26D3) | 24 oz | Built-in bracket for walls or posts | Not stated | Not stated |
| Chapin 4702, 32 oz (B07D9W9C5P) | 32 oz | Built-in bracket for walls or posts | Not stated | Not stated |
| Chapin 4710, 1 gallon (B07HR72KZB) | 1 gallon | Standard hose fittings to spigot or irrigation | 1 to 10 oz per gallon | 4 inch |
| Chapin 4720, 2 gallon (B07HRH4B81) | 2 gallon | Standard hose fittings to spigot or irrigation | 1 to 10 oz per gallon | 4 inch |
| Chapin G405 hose end (B00UER1S14) | Not stated | Fits onto any hose end | Spray dial, 4 patterns | Not stated |
Chapin 4700 HydroFeed 16 oz (B07D9T33BC)
The listing gives a 16 oz clear tank with a funnel-shaped head, an adjustable connection elbow that mounts the tank to a hose spigot, and a rigid inlet tube with a filter. The drain plug has a valve so you can empty the tank after use. The listing says it suits liquid or granular concentrates and fish emulsion. Best for: small jobs on one spigot. Skip if: you need a tank bigger than 16 oz.
Chapin 4701 HydroFeed 24 oz (B07D9T26D3)
The 24 oz tank has the same funnel head, O-ring opening, inlet filter and drain valve as the 16 oz model. Its difference is a built-in bracket for walls or posts, which the listing gives as the mounting method. Best for: a tank you want fixed to a wall or post. Skip if: you need the elbow mount instead.
Chapin 4702 HydroFeed 32 oz (B07D9W9C5P)
The 32 oz tank is the largest of the three ounce-sized Chapin tanks in this set. It has the same bracket mount, funnel head and drain valve as the 24 oz model. Best for: the biggest ounce-sized tank here. Skip if: you need a gallon-sized tank with a stated rate range.
Chapin 4710 HydroFeed 1 gallon (B07HR72KZB)
The 1 gallon tank has a 4 inch opening for filling and a variable rate of 1 to 10 oz of product per gallon. The tank is translucent so you can see the level. The listing says it connects to a hose spigot or an irrigation system using standard hose fittings. The listing does not give a flow rate in gallons per minute. Best for: a set rate on a gallon tank. Skip if: you need a bigger tank.
Chapin 4720 HydroFeed 2 gallon (B07HRH4B81)
The 2 gallon version has the same 4 inch opening, 1 to 10 oz per gallon rate, translucent tank and standard hose fittings as the 1 gallon model. The only stated difference in the listing is the capacity. Best for: longer sessions on one tank. Skip if: you need a smaller tank.
Chapin G405 Fertilizer Feeder Hose End (B00UER1S14)
The G405 is not an inline tank. It fits onto the end of the hose. The listing says its large bottle mixes dry and water-soluble fertilizers without premixing, and that it has a four-pattern spray dial with an anti-siphon feature. The listing says the polymer body is chemical resistant and rustproof. The listing does not give a capacity. Best for: a hose-end feed with a spray dial. Skip if: you want the unit to sit inside the hose line.
Worked example: the rate range on the 2 gallon tank
Take the Chapin 4720, a 2 gallon tank, with the listing rate of 1 to 10 oz per gallon. At the low end, 2 gallons times 1 oz per gallon gives 2 oz of product for a full tank. At the high end, 2 gallons times 10 oz per gallon gives 20 oz. So a full tank covers a range from 2 oz to 20 oz of product, depending on the setting. The listing gives the range but not the dial markings, so set the rate by the instructions that come with the unit.
Mistakes to avoid
- Assuming every unit has a rate setting. Only the 1 gallon and 2 gallon listings state one.
- Buying a 16 oz tank for a long watering session. The 2 gallon tank holds more.
- Choosing the hose-end sprayer when you want the unit to sit in the line. The G405 attaches to the hose end.
- Skipping the drain valve. The listings say the valve empties the tank after each use.
Who should skip these
If your setup has no hose spigot, none of the tank units fits, and the G405 needs a hose end to attach to. If you need a stated flow rate in gallons per minute, the listings here do not give one, so look elsewhere for that number.
FAQ
Which unit has a rate setting?
The Chapin 4710 1 gallon and Chapin 4720 2 gallon listings state 1 to 10 oz per gallon. The others do not state one.
Can I use the G405 on a tank system?
The G405 listing describes a hose-end feeder that attaches to the end of the hose. It is not described as a tank system.
Which units say they work with granular fertilizer?
The 16 oz, 24 oz, 32 oz, 1 gallon and 2 gallon Chapin listings say they suit liquid or granular concentrates. The G405 listing names dry and water-soluble fertilizers.
How big is the opening on the gallon tanks?
The 1 gallon and 2 gallon listings give a 4 inch opening.
Does the listing give flow rates?
No. None of the six listings gives a flow rate in gallons per minute.
Bottom line
For a tank in the hose line, choose from the Chapin HydroFeed range. Choose a gallon tank if you want the 1 to 10 oz rate range. For a hose-end feed, the G405 is the listing in this set. Check the capacity you need, and read your own fertilizer label before you mix.
Related guides
- Best hose nozzle with soap dispenser
- Best garden hose to drip irrigation adapter
- Best garden hose connector with shut-off valve
- Best heavy-duty 4-way hose splitter
Sources
All product facts come from Amazon listings opened on 2026-10-17. No outside source was opened for this draft.
For general guidance on fertilizer labels and feeding through a hose, see extension.org, the national network of university extension services.
