Sprayer works great. Fill it on a bench or table and slide it on. It fits comfortably, and you never have to take it off until you are done with the entire contents. Great pressure easily maintained with a gentle, constant pump with one hand while directing the spray with the other. Can’t find anything I don’t like about it.
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List Price: $119.99 
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This item: SOLO 425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi
$97.00
Get it as soon as Tuesday, Apr 8
In Stock
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$9.20
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From the brand
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In 1948 the brothers Hans and Heinz Emmerich designed the first small two-stroke engine weighing in at 14.3 pounds, an incredible feat for that time. Shortly after, in 1951, the brothers developed the world´s first engine driven backpack mist blower. Instead of using stationary engine driven pumps with long spray hoses and lots of manpower, the new machines were able to be operated "solo", by only one person - the birth of our future name.
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From the manufacturer
Solo 425 Professional Piston Backpack Sprayer
Best in Class Features
The Solo 425 manual 4-gallon 60 psi high-pressure backpack sprayer features an ultraviolet resistant tank, felt padded polyester straps, a heavy duty pressure cylinder, and a reversible pump lever.
Best in Class Quality
The Solo 425 is made of all high-grade, corrosion resistant plastic, and is designed to ensure no metal or rubber parts are made vulnerable to chemicals.
Full Range of Applications
Easily and effectively handles disinfectants, fertilizers, herbicides, pesticides, and formulations for tree, shrub and plant protection and wood and concrete finishing and treatments.
Key Features
- High performance piston pump
- Rugged metal frame for stability
- Extra-large tank opening
- 28" unbreakable wand
- 48" high pressure hose
- Double filtration system
Professional Quality and Design
4-Gal, UV Resitant, High Density Polyethylene Tank
Easily and effectively handles fertilizers, herbicides, pesticides, and formulations for tree, shrub, and plant protection, as well as disinfectants, and cleaning solutions.
Piston Pump with Viton Collar
Produces a pressure of up to 90 psi enabling the operator to perform virtually every spraying task.
Padded Straps
Padded polyester straps for greater operator comfort, preventing fatigue.
4.25 inch Opening
Allows for Easy Filling and Cleaning.
Solo 425
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Solo 475-B
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475-B-DELUXE
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Solo 473-P
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Solo 416-Li
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Solo 451
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| Customer Reviews |
1,590
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| Price | $97.00 | $108.92 | $101.07 | — no data | $508.99 | — no data |
| Tank Size | 4-Gallons | 4-Gallons | 4-Gallons | 3-Gallons | 5-Gallons | 3-Gallons |
| Large Opening | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
| Pump Type | Piston | Diaphragm | Diaphragm | Piston | Motorized | Motorized |
| Deluxe Shoulder Straps | no data | no data | ✓ | no data | ✓ | ✓ |
| Brass Nozzle | no data | no data | ✓ | no data | no data | no data |
| Pressure Regulator | no data | no data | ✓ | no data | ✓ | ✓ |
| Operation | Manual | Manual | Manual | Manual | Lithium Battery | Gas Powered |
Compare with similar items
This Item  SOLO 425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi | Recommendations  |  |  |  |  | |
| Price | -19% $97.00 List: $119.99 | $89.99 | $159.99 | $109.75 | -9% $108.92 List: $119.95 | $124.00 |
| Delivery | Get it as soon as Tuesday, Apr 8 | — | — | Get it as soon as Tuesday, Apr 8 | Get it as soon as Tuesday, Apr 8 | Get it as soon as Tuesday, Apr 8 |
| Customer Ratings | ||||||
| Sold By | Amazon.com | Amazon.com | Greener-Garden | Amazon.com | Amazon.com | Amazon.com |
| tank volume | 4 gallons | 4 gallons | 4 gallons | 4 gallons | 4 gallons | 4 gallons |
| hose length | 48 inches | 46 inches | — | 48 inches | 48 inches | 50 inches |
| power source | Manual | Hand Powered | Hand Powered | — | Hand Powered | Hand Powered |
| material | High Density Polyethylene (HDPE) | Fiberglass, Polyethylene, High Density Polyethylene | Polyethylene (PE), Brass | Plastic, Metal | Acrylic | Poly |
| maximum pressure | 90 pounds per square inch | — | 100 pounds per square inch | 90 pounds per square inch | 60 pounds per square inch | 150 pounds per square inch |
| number of items | 1 | 1 | — | 1 | 1 | 1 |
| style | Sprayer | Backpack | Adjustable,Unique,Deluxe | Knapsack | Adjustable | 4 Gallon |
Great for Organic Gardening Uses
I bought this sprayer based on the recommendations of a Soil Health Expert for use with compost tea, based on pressure and nozzle opening size to allow for microbes to pass through.The assembly instructions are not user-friendly and I struggled to follow them. (And I rarely struggle with instruction manuals). Thankfully, I was able to find a video on YouTube after seArching “Solo 425 backpack sprayer assembly”. The video from Planet Mojo is slightly slow, but easy to follow and helped me figure it out.If using for compost tea, don’t forget to remove the filter. It is located in the spray nozzle, but you will need to remove the top 2 pieces before accessing it.After assembly, it has been relatively easy to use.Other benefits:-Backpack straps are easy to adjust.- Pressure is easy to manually adjust.- Filter at opening is great for compost tea that was not made in a bag.Overall, I would probably continue to recommend this sprayer for use with compost teas and organic fertilizers. I did a lot of research prior to purchasing and this seems to be the best one.
Top reviews from the United States
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- Reviewed in the United States on December 2, 2022
I wanted a sprayer similar to what the pest control companies use and this sprayer meets my criteria
Style: SprayerVerified Purchase
Top reviews from other countries
- Amazon CustomerReviewed in the United Kingdom on September 16, 2024
Leaked chemical on me
Style: SprayerVerified Purchase - Phillip havasReviewed in Australia on November 13, 2020
Poor quality
Style: SprayerVerified Purchase
