---
product_id: 82567118
title: "425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi"
brand: "solo"
price: "฿13896"
currency: THB
in_stock: true
reviews_count: 8
category: "Solo"
url: https://www.desertcart.co.th/products/82567118-425-4-gallon-piston-backpack-sprayer-wide-pressure-range-up
store_origin: TH
region: Thailand
---

# 4-gallon tank capacity Up to 90 psi adjustable pressure 4 commercial-grade interchangeable nozzles 425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi

**Brand:** solo
**Price:** ฿13896
**Availability:** ✅ In Stock

## Summary

> 🌿 Spray Smarter, Not Harder — The Pro’s Choice for Garden Mastery!

## Quick Answers

- **What is this?** 425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi by solo
- **How much does it cost?** ฿13896 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/82567118-425-4-gallon-piston-backpack-sprayer-wide-pressure-range-up)

## Best For

- solo enthusiasts

## Why This Product

- Trusted solo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Lockable Shut-Off Valve:** Minimize fatigue with a secure on/off valve that locks in place for continuous spraying.
- • **Pro-Grade Nozzle Variety:** Switch between fan, cone, jet, and adjustable sprays for ultimate application accuracy.
- • **Ergonomic & Durable Design:** Comfort-fit backpack with UV-resistant tank and rugged metal frame built to last seasons.
- • **Precision Pressure Control:** Adjust pressure up to 90 psi for every task, from delicate misting to powerful streams.
- • **Versatile 4-Gallon Capacity:** Spray more, refill less—cover large areas effortlessly.

## Overview

The SOLO 425 is a professional-grade 4-gallon backpack sprayer featuring a high-performance piston pump capable of up to 90 psi pressure. Equipped with four commercial-grade interchangeable nozzles and a durable, UV-resistant tank, it offers versatile spraying for disinfectants, fertilizers, herbicides, and pesticides. Designed for comfort and longevity, it includes an ergonomic frame, lockable shut-off valve, and chemical-resistant Viton seals, making it a reliable tool for efficient plant and garden care.

## Description

Product Description Built for comfort. Built for convenience. Built to last. SOLO sprayers are professional grade, triple test inspected and made in the USA. The SOLO 425, with a connecting rod-actuated piston pump, can produce a wide pressure range of up to 90 psi and is capable of performing virtually every spraying task. With a proven piston pump, you will be reliably equipped for applying spray liquid or insecticides in your garden. A low number of wearing parts and sturdy technology ensure a long service life and minimum maintenance. The large filling aperture for convenient filling of the tank and smooth-running pump make spraying pleasant work. The ergonomic design contours to your back for greater comfort. desertcart.com The Solo manual 4-gallon 90 psi high-pressure backpack sprayer features an ultraviolet resistant tank, felt padded polyester straps, a heavy duty pressure cylinder and reversible pump lever. The high pressure backpack sprayer is made of all high-grade, corrosion resistant plastic, with no metal or rubber parts made vulnerable to chemicals. The chemical backpack applicator includes a connecting rod actuated piston pump to produce a wide pressure range up to 90 psi, 4-foot high pressure hose, a spray tube of 20 in. and can carry up to 45 pounds. With its easy operating shut off valve, durable plastic parts, and 4-1/4-inch opening, it can handle disinfectants, fertilizers, herbicides, and pest control products for efficient tree, shrub, and plant protection. This tool is backed by a 1-year limited manufacturer's warranty. From the Manufacturer Since its introduction to the US market in 1964, Solo's popular 425 backpack sprayer has been the standard by which all backpack sprayers are measured. High-density polyethylene tank with ultra-violet inhibitors allows for unmatched durability and ultra-violet protection. Large 4.25-Inch opening for easy filling and cleaning. Shut-off valve and wand with an overall length of 28 inches for hard-to-reach places. 4-foot high-pressure hose. With its connecting rod-activated piston pump, the 425 is capable of producing a wide pressure range of up to 90-psi, and is capable of performing virtually every spraying task. Easily and effectively handles disinfectants, fertilizers, herbicides, pesticides, and formulations for tree, shrub and plant protection and wood and concrete finishing and treatments. Solo backpacks are constructed of high density polyethylene and other chemical resistant materials. A 1-year warranty is provided. Given proper maintenance, the sprayer should last for millions of pumps and many years of use. Each Solo sprayer is equipped with an adjustable, flat spray, hollow cone and jet stream nozzle to accommodate virtually every spraying need. Padded straps with pull tabs make adjustments quick and easy. Built-in strainers, screens and filters help keep debris out of nozzles. Pressure can be regulated to 15, 30 , 45 or 60 psi by means of a built-in pressure regulating valve. Unbreakable wand prevents damage common to brass and brittle plastic wands. Viton seals, gaskets and O-rings provide excellent chemical resistance and durability.

Review: The pack is reasonably comfortable to wear - I used this all last summer to spray fish and seaweed based fertilizer around my 2 acres of orchard and gardens. It works well for me. I bought a longer tube for the wand so I can reach higher in my trees. The pack is reasonably comfortable to wear, even when full because it is well balanced and the handle for the pressure pump is easy to access when walking. When spraying my trees I tend to lock the trigger in the ON position and use the pressure pump to maintain a constant pressure. I find it very easy to use. The only problems that I have had are that the soft plastic tube came loose from the main tank and the trigger sometimes doesn't work correctly when locked in the ON position for too long. The plastic tube coming loose caused my pants to get wet because the fluid started coming out through the bottom. It was an easy fix and just required adjusting the tension on the clamp holding it in place. I think it came loose partly because I had put too much pressure in the tank. I deal with the trigger problem by sometimes releasing the lock when walking around and it seems to be fine. Even with the small problems that I had I still love this unit and am glad I bought it. I would certainly buy it again if I needed a second pack.
Review: Wand poor - Good sprayer

## Features

- Easily spray liquid disinfectants, fertilizers, herbicides, pesticides with Solo's high-performance piston pump for tree, shrub and plant protection
- Solo’s 425 backpack sprayer includes a 20-inch unbreakable wand that securely connects to a 48-inch nylon-reinforced high-pressure hose for an extended reach
- Four easily changeable commercial-grade spraying nozzles-Plastic Adjustable, Fan Spray, Hollow Cone, Jet Stream nozzle and is TeeJet compatible
- Designed with a commercial shut-off valve that securely locks in either the on or off position to minimize user fatigue, the pump handle is interchangeable for left or right-hand operation
- Solo's rugged metal frame with an extra-large tank opening makes it easy to fill and clean quickly
- Thoughtfully designed with Viton seals placed in key locations to ensure long service and durability

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #6,955 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #40 in Lawn & Garden Sprayers |
| Brand | SOLO |
| Color | white |
| Customer Reviews | 4.2 out of 5 stars 1,679 Reviews |
| Item Weight | 9.9 Pounds |
| Material | High Density Polyethylene (HDPE) |
| Recommended Uses For Product | Pest Control, Fertilizer sprayer, Herbicide sprayer, Sanitizing |
| Tank Volume | 4 Gallons |

## Product Details

- **Brand:** SOLO
- **Color:** white
- **Material:** High Density Polyethylene (HDPE)
- **Recommended Uses For Product:** Pest Control, Fertilizer sprayer, Herbicide sprayer, Sanitizing
- **Tank Volume:** 4 Gallons

## Images

![425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi - Image 1](https://m.media-amazon.com/images/I/71XsmIzM8ZL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Can this be used inside?**
A: Yes.  I think people have applied stains with it.  Be sure to wear appropriate PPE whenever using a sprayer inside.

**Q: Can I use this sprayer for water based sealer for my paver driveway?**
A: Yes, have used it for that a few times. Just clean out when done.

**Q: Can use it to stain wooden fence**
A: I don't know since I use the sprayer for landscaping purposes.  The question might be answered by reading the stain manufacturer's information sheet regarding the use of a paint sprayer - which a completely different piece of equipment than this Solo backpack sprayer which is made to use with disinfectants, fertilizers, herbicides and pesticides .  Also are you going to use water base or oil base stain, a translucent or an opaque stain?  Each has a different application method. Water base stain is usually running and are "wipe" off meaning you apply the stain, allow it to penetrate the wood then wipe off the excess before it dries, opaque stains are more similar to paint in that they sit on the surface of the wood and are usually not wiped off, etc... oil versus water gives you may other differences of application and clean up. I suggest you try googling for best sprayers for staining a fence and see what they recommend. Good Luck.

**Q: hi, does this come complete with a harness?**
A: Yes, this comes with the "backpack like" harness. If you search online for images of "Solo 425", some pictures will show you the harness.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The pack is reasonably comfortable to wear
*by A***D on April 28, 2015*

I used this all last summer to spray fish and seaweed based fertilizer around my 2 acres of orchard and gardens. It works well for me. I bought a longer tube for the wand so I can reach higher in my trees. The pack is reasonably comfortable to wear, even when full because it is well balanced and the handle for the pressure pump is easy to access when walking. When spraying my trees I tend to lock the trigger in the ON position and use the pressure pump to maintain a constant pressure. I find it very easy to use. The only problems that I have had are that the soft plastic tube came loose from the main tank and the trigger sometimes doesn't work correctly when locked in the ON position for too long. The plastic tube coming loose caused my pants to get wet because the fluid started coming out through the bottom. It was an easy fix and just required adjusting the tension on the clamp holding it in place. I think it came loose partly because I had put too much pressure in the tank. I deal with the trigger problem by sometimes releasing the lock when walking around and it seems to be fine. Even with the small problems that I had I still love this unit and am glad I bought it. I would certainly buy it again if I needed a second pack.

### ⭐⭐⭐⭐⭐ Wand poor
*by B***T on December 19, 2025*

Good sprayer

### ⭐⭐⭐⭐⭐ I wanted a sprayer similar to what the pest control companies use and this sprayer meets my criteria
*by C***R on December 2, 2022*

I wanted a sprayer similar to what the pest control companies use, and this meets the criteria. It was easy to unpack and get started with. The pump arm works great. It is so nice to be able to pump a sprayer without having to put it on flat ground. And I do not have to pump it as much as one of those cheap sprayers that you carry and have to place on the ground to pump. I can keep my spray pattern consistent by quickly and easily doing one more pump using the arm, which really speeds up my work. Only time will tell how well it holds up, but so far I love it. Well worth the money.

## Frequently Bought Together

- SOLO 425 4-Gallon Piston Backpack Sprayer, Wide Pressure Range up to 90 psi
- Solo 4800170-P Sprayer Shut-Off Valve
- Solo 4900654-P Sprayer Elbow Nozzle Assembly Plus Standard Nozzle Assortment,Black

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-01-24*