Commercial-Grade Venturi Fertigation for 1″ Drip Systems
The 1″ Mazzei Venturi Injector is a commercial-grade, no-moving-parts fertilizer injector designed for drip irrigation fertigation. Using the venturi effect, it creates a pressure differential to draw liquid fertilizer from virtually any container and inject it precisely into your water line. It is available in two models — High Flow and Low Flow — so you can match the injector to your system’s actual GPH flow rate. The injector is also available as a Suction Assembly kit.
A complete, ready-to-operate unit requires three separate components: an injector, a bypass assembly, and a suction assembly (all sold separately here). The 1″ Mazzei suction assembly (compatible kit model K-183 or 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 container. It is critical to size the injector correctly: an oversized injector will not draw fertilizer at all, while an undersized one will restrict system flow. When in doubt, choose a smaller model and install on a bypass. Rebuild kits (seal, ball, and spring) are available to service all 1″ Mazzei models.
- No Moving Parts: Venturi design means nothing to wear out — incredibly reliable and low-maintenance once dialed in.
- Two Flow Models: High Flow and Low Flow options let you match the injector to your system’s actual operating GPH, not just pipe size.
- Bypass Installation Recommended: Best installed on a bypass loop with ball valves to fine-tune suction and minimize main-line restriction.
- Draws from Any Container: The suction assembly connects to any open fertilizer bucket or barrel for flexible operation.
- Rebuildable: Internal seal, ball, and spring are replaceable with a DripWorks rebuild kit, extending the injector’s service life.
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.
