The 1½" Mazzei Bypass Suction Assembly Kit (K-183-A) provides all the hardware needed to build a fully functional fertigation bypass loop around your 1½" Mazzei Venturi injector. Installing the injector on a bypass — rather than directly in-line — is Mazzei's recommended method: it creates the pressure differential required for reliable suction while preserving full system flow. This kit is designed for commercial agriculture, large-scale nurseries, cannabis operations, and any irrigation system requiring high-volume liquid fertigation or chemigation.
Everything required for bypass and suction plumbing is included in one package. Note: The injector itself and any hose-barb cap are sold separately and are not included in this kit. For assistance sizing or ordering 1½" Mazzei accessories, please call DripWorks at 1-800-522-3747.
| Item | Part No. | Description | Qty. |
|---|---|---|---|
| Stainless Hose Clamp, 1½" | 13H-28 | Clamp for high-pressure hose ends | 4 |
| Adapter, 1½" MNPT × Insert | 1436-015 | Male NPT to barb insert adapter | 2 |
| High-Pressure Hose, 1½" I.D. × 16" | AG200 | Black high-pressure bypass hose | 2 |
| Adapter, 1½" FNPT × Barb | 1435-010 | Female NPT to barb adapter | 2 |
| Plastic Tube Clamp | CLAMP#44 | Clamp for suction tubing | 2 |
| Vinyl Tubing, ½" I.D. × ¾" O.D. × 2" | VT-050 | Short connector tubing | 1 |
| Tubing Adapter, ½" FNPT × ½" Barb | TA-550F | Suction line adapter | 2 |
| Metering Valve MV-5 | MV-5 | Controls fertilizer injection rate | 1 |
| Vinyl Tubing, ½" I.D. × ¾" O.D. × 10 ft. (coiled) | VT-050 | Suction line to fertilizer tank | 1 |
| Strainer S-50HB | S-50HB | End strainer for suction line | 1 |
Injector unit and hose-barb cap are not included. Reference Mazzei drawing K-183-A.
Why should I use a bypass instead of installing the injector directly in-line?
Installing the Mazzei injector on a bypass is Mazzei's recommended method. A bypass loop allows you to partially close a main-line valve to divert a controlled portion of water through the injector, creating the pressure differential needed for suction without restricting overall system flow.
Direct in-line installation may not generate sufficient pressure drop, resulting in little or no fertilizer suction.
Is the injector included with this kit?
No. The injector and any hose-barb cap must be purchased separately. This kit contains only the bypass hoses, adapters, clamps, metering valve, suction tubing, and strainer needed to complete the installation.
Shop compatible 1½" Mazzei injectors separately, or call us at 1-800-522-3747 for help building a complete system.
What type of fertilizer can I use with the Mazzei injector?
Mazzei injectors require liquid fertilizers, as the Venturi suction system draws solution directly from a tank through the suction tubing included in this kit.
Compatible with most water-soluble liquid fertilizers, acids, and agricultural chemicals. Always flush the system with clean water after each fertigation cycle.
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