1" Mazzei Injectors and Accessories

Mazzei injectors are sized by the total GPH flow rate of your irrigation system — not by the size of your mainline pipe or your water source's available flow.

• Add up the rated GPH of all emitters, drip tape, sprayers, or other watering devices operating simultaneously in your zone.
• Select the injector model whose flow range matches that total.
• Oversized injector: Will not draw fertilizer at all.
• Undersized injector: Will restrict system water flow.
• If your system's flow falls between models, always choose the smaller size and install on a bypass assembly to regulate flow.

The injector requires a minimum 5 PSI pressure drop from inlet to outlet to generate suction. Installing on a bypass with ball valves (sold separately) is the preferred method to achieve this differential with the least restriction on your main line.

What three parts are needed for a complete Mazzei fertigation unit?
You need the injector itself, a bypass assembly, and a suction assembly. All three are sold separately and must be purchased together to create a fully operational fertigation system.

What does the 1" suction assembly include?
The compatible Mazzei suction kit for 1" injectors (K-183 / KR-183) includes clear vinyl tubing, a metering valve or PVC ball valve, a strainer, tubing adapters, and clamps — everything needed to connect the injector to your fertilizer source.

What type of fertilizer can I use?
Use only liquid or water-soluble fertilizers with less than 0.5% insoluble impurities. The Mazzei draws liquid directly from a container, so solids that do not fully dissolve can clog the suction strainer.

Can I repair my Mazzei injector instead of replacing it?
Yes. DripWorks carries Mazzei rebuild kits containing a replacement seal, ball, and spring for all 1" models, so you can restore full performance without buying a new injector.