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 and the Greenworks 80V 4 Gallon are evenly matched, rated 3.7 and 3.6. The My4Sons M4 Agitator leads on features and spray power. The Greenworks 80V 4 Gallon wins on value. The Greenworks 80V 4 Gallon costs $110.10 less ($189.89 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.
Greenworks 80V 4 Gallon
A low-priced 4-gallon kit with a long runtime, for owners of Greenworks 80V tools.
Amazon $189.89$189.89
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, 4 or more nozzles) and spray power (up to 80 PSI vs up to 70 PSI).
- Choose the Greenworks 80V 4 Gallon for value ($47.47 per gallon of tank ($189.89, 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 | Greenworks 80V 4 Gallon |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| Value 25% | 30 $75 per gallon of tank ($299.99, 4 gal) | 59 $47.47 per gallon of tank ($189.89, 4 gal) |
| Tank size 10% | 67 4 gal tank | 67 4 gal tank |
| Spray power 20% | 71 up to 80 PSI | 61 up to 70 PSI |
| Runtime or airflow 20% | 100 50 tanks per charge (200 gal) | 100 50 tanks per charge (200 gal) |
| Features 15% | 90 battery and charger included, adjustable pressure, 4 or more nozzles, metal wand, agitator | 45 battery and charger included, 4 or more nozzles |
| Warranty 10% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| My4Sons M4 Agitator | Greenworks 80V 4 Gallon | |
|---|---|---|
| Spraying | ||
| Tank | 4 gal | 4 gal |
| Max pressure | 80 PSI | 70 PSI |
| Nozzles included | 9 | 5 |
| Wand length | 48 in | - |
| Hose length | 60 in | - |
| Power | ||
| Battery | 12 V 8 Ah, included | 80 V 2 Ah, included |
| Runtime per charge | 6 hours | - |
| Gallons per charge | 200 gal | 200 gal |
| Tanks per charge | 50 | 50 |
| Features | ||
| Adjustable pressure | Yes | - |
| Metal wand | Yes | - |
| Agitator | Yes | No |
| Gauge or control panel | No | No |