Keep your MixRite fertilizer injector running at peak performance with this genuine Plastic Engine Spring Kit (Part #36000000191). Each kit contains 2 replacement springs and is compatible with the MixRite TF3, TF5, TF10, and TF25 series injectors. Springs are a normal wear item in the MixRite pump mechanism — having a spare set on hand minimizes downtime during the growing season and is an easy, low-cost way to restore accurate fertigation metering.
These springs are NOT compatible with the following models:
| MixRite Series | Models | Manufacturer Part # |
|---|---|---|
| TF3 | TF3.002 (.3–2%), TF3.004 (.4–4%) | 36000000191 |
| TF5 | TF5.001, TF5.002, TF5.005 | 35100000045 |
| TF10 | TF10.001, TF10.002, TF10.005 | 35100000045 |
| TF25 | TF25.001, TF25.002, TF25.005 | 35000000045 |
Note: Per the manufacturer's TF Series parts document, TF3 models use part # 36000000191. TF5, TF10, and TF25 models share the Plastic Engine Spring Kit part # 35100000045 / 35000000045. Confirm your model number before ordering if you have any questions.
How do I know if my MixRite springs need replacing?
If your MixRite injector is no longer metering chemical accurately, or if the pump action feels weak or inconsistent, worn springs are a common cause.
Inspect the springs during routine maintenance. Cracked, deformed, or fatigued plastic springs should be replaced immediately to restore accurate injection ratios.
How many springs come in this kit?
Each kit includes 2 plastic engine springs — one complete set for a single MixRite injector unit.
Will these springs work with my MixRite 2% Adjustable Injector?
No. These springs are not compatible with the 1" (IMRTF52) or 1½" (IMRTF102) MixRite Adjustable models.
If you are unsure of your model, check the label on your injector body or contact our team for help identifying the correct part.
Sep 30th 2026
Sep 29th 2026
Sep 24th 2026
Sep 23rd 2026
