My4Sons M4 Agitator
The M4 with a built-in agitator, for anyone spraying powders or mixes that settle in the tank.
Amazon $299.99$299.99
The My4Sons M4 Agitator is the better battery backpack sprayer overall, rated 3.7 to 3.4. The My4Sons M4 Agitator leads on features. The Jacto SB-16 wins on value. The Jacto SB-16 costs $50 less ($249.99 vs $299.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Jacto SB-16
A long-running 4-gallon Jacto with digital pressure control, for crews spraying low-pressure herbicide over long days.
Amazon $249.99$249.99
Which should you buy?
- Choose the My4Sons M4 Agitator for features (battery and charger included, adjustable pressure, 4 or more nozzles, metal wand, agitator vs battery and charger included, adjustable pressure, metal wand, gauge or control panel).
- Choose the Jacto SB-16 for value ($62.50 per gallon of tank ($249.99, 4 gal) vs $75 per gallon of tank ($299.99, 4 gal)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4 gallons and up battery backpack sprayer; a clear win is highlighted. How we rank explains each one.
| Factor weight | My4Sons M4 Agitator | Jacto SB-16 |
|---|---|---|
| Overall rating | 3.7/5 | 3.4/5 |
| Value 25% | 30 $75 per gallon of tank ($299.99, 4 gal) | 42 $62.50 per gallon of tank ($249.99, 4 gal) |
| Tank size 10% | 67 4 gal tank | 67 4 gal tank |
| Spray power 20% | 71 up to 80 PSI | 0 pressure not published, scored as zero |
| Runtime or airflow 20% | 100 50 tanks per charge (200 gal) | 100 13 hours per charge |
| Features 15% | 90 battery and charger included, adjustable pressure, 4 or more nozzles, metal wand, agitator | 75 battery and charger included, adjustable pressure, metal wand, gauge or control panel |
| Warranty 10% | 0 warranty not published, scored as none | 50 3-year warranty |
Specifications
| My4Sons M4 Agitator | Jacto SB-16 | |
|---|---|---|
| Spraying | ||
| Tank | 4 gal | 4 gal |
| Max pressure | 80 PSI | - |
| Nozzles included | 9 | - |
| Wand length | 48 in | - |
| Hose length | 60 in | - |
| Power | ||
| Battery | 12 V 8 Ah, included | - |
| Runtime per charge | 6 hours | 13 hours |
| Gallons per charge | 200 gal | - |
| Tanks per charge | 50 | - |
| Features | ||
| Adjustable pressure | Yes | Yes |
| Metal wand | Yes | Yes |
| Agitator | Yes | No |
| Gauge or control panel | No | Yes |
| Build | ||
| Warranty | - | 3 years |