These 3/4" Mazzei Injector Kits are complete, ready-to-install fertigation systems designed for farmers, commercial growers, and serious gardeners who need reliable, accurate liquid fertilizer or chemical injection. Each kit combines a Mazzei polypropylene venturi injector with an F-30 liquid flowmeter (5–40 GPH range) and a K-184 suction line kit — giving you everything needed to draw fertilizer from any open container directly into your irrigation mainline.
Mazzei venturi injectors operate with no moving parts, using differential pressure to draw liquid from the suction line into the water stream. This makes them exceptionally durable and nearly maintenance-free. Choose between two flow rate variants to match your system's GPH demand — an undersized injector will restrict flow, while an oversized one won't draw at all.
Important: Mazzei injectors require a pressure differential across the inlet and outlet to function. Install on a bypass line or after a flow-control valve. All injectors require liquid fertilizers only — not dry or granular products.
Specifications for system planning and selection.
| Specification | Lo Flo Kit (K484A-S) | Hi Flo Kit (K584-S) |
|---|---|---|
| Injector Model | 0484-A PP | 0584 PP |
| Injector Size | 3/4" (20mm) | 1/2" (15mm) |
| Injector Body Material | Polypropylene (PP) | Polypropylene (PP) |
| Moving Parts | None (Venturi) | None (Venturi) |
| Flowmeter | F-30 L, 1/4" Barb, 5–40 GPH | F-30 L, 1/4" Barb, 5–40 GPH |
| Suction Tubing | 1/4" I.D. x 3/8" O.D., 10 ft. clear vinyl | 1/4" I.D. x 3/8" O.D., 10 ft. clear vinyl |
| Suction Valve | PP Ball Valve, 5/16" Orifice, 1/4" FNPT | PP Ball Valve, 5/16" Orifice, 1/4" FNPT |
| Strainer | S-25HB | S-25HB |
| Brand | Mazzei | Mazzei |
How do I choose between the Lo Flo and Hi Flo kit?
Select the kit that matches your irrigation system's operating flow rate in GPH. An oversized injector will not draw fertilizer at all; an undersized one will restrict water flow through your system.
If you're unsure of your system's flow rate, use a bucket and timer to measure GPH at your water source before selecting a model.
Can I use dry or granular fertilizer with these injectors?
No. Mazzei venturi injectors work by suction and require liquid fertilizers only. Dry or granular products must be dissolved into a liquid solution before use.
Water-soluble fertilizers with less than 0.5% insoluble impurities work best to prevent clogging of the suction strainer and your drip emitters.
Do these injectors require electricity or a pump?
No. Mazzei venturi injectors are entirely powered by the differential pressure of water flowing through your irrigation line — no electricity, no pump, and no moving parts to wear out.
A minimum pressure differential across the injector inlet and outlet is required for suction to occur. Installing the injector on a bypass loop is the most common and reliable installation method.
What is the flowmeter included in the kit used for?
The F-30 L liquid flowmeter (5–40 GPH, 1/4" barb) monitors the rate at which fertilizer solution is being drawn from your container, allowing you to accurately control and repeat your injection dosage.
Pair your Mazzei Injector Kit with these essential components for a complete setup:
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