The Mazzei Rebuild Kit contains genuine OEM replacement parts for the internal check valve of your Mazzei venturi fertilizer injector. Rather than replacing the entire injector, these kits let you quickly restore full function at a fraction of the cost. Each kit includes a PTFE suction port ball, a Kel-F® gasket, and — for all models except the 1/2" low-flow units (IM12VLF and IM12L) — a Hastelloy® C-22 spring. Three kit sizes are available to match your injector:
Tip: When disassembling your Mazzei for cleaning, take care not to lose the small internal ball and spring — these are exactly the parts this kit replaces.
Which rebuild kit fits my Mazzei injector?
Select your kit by injector size and model: the 1/2" kit (IM12KIT) fits low-flow models IM12VLF and IM12L only; the 3/4" kit (IM34KIT) fits the 1/2" high-flow model IM12H and all 3/4" models IM34L and IM34H; the 1" kit (IM1KIT) fits all 1" models IM1L and IM1.
Does the 1/2" low-flow kit include a spring?
No. The internal check valves in the 1/2" low-flow models (IM12VLF and IM12L) operate without a spring, so the IM12KIT includes only the PTFE ball and Kel-F® gasket. All other kits include the Hastelloy® C-22 spring as well.
How do I know when my injector needs a rebuild kit?
Common signs include a significant drop in fertilizer draw rate, the injector failing to draw fertilizer at all, or visible wear or damage to the internal ball, gasket, or spring discovered during routine cleaning.
May 14th 2026
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