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Milwaukee M18 4-Gallon Backpack Sprayer Kit SWITCH TANK
- $204.00
- Brands Milwaukee
- Product Code: 3019-21PS
- Availability: In Stock
Milwaukee M18 4-Gallon Backpack Sprayer Kit with SWITCH TANK™ – 3019-21PSProduct OverviewThe Milwaukee M18 4-Gallon Backpack Sprayer Kit with SWITCH TANK™ (3019-21PS) is a cordless, battery-powered sprayer designed for professional landscape maintenance and a wide range of chemical spraying applications. It combines a 4-gallon interchangeable tank with an M18 powered base to provide instant, const..
Key Features of Milwaukee M18 4-Gallon Backpack Sprayer Kit
Milwaukee M18 4-Gallon Backpack Sprayer Kit with SWITCH TANK™ – 3019-21PS
Product Overview
The Milwaukee M18 4-Gallon Backpack Sprayer Kit with SWITCH TANK™ (3019-21PS) is a cordless, battery-powered sprayer designed for professional landscape maintenance and a wide range of chemical spraying applications. It combines a 4-gallon interchangeable tank with an M18 powered base to provide instant, constant, and adjustable pressure without manual pumping.
A five-mode pressure and flow adjustment system allows the operator to control liquid delivery according to the application. The system provides pressure of up to 140 PSI, while the flow-rate selector adjusts output from 0.10 to 0.52 GPM. Milwaukee rates the included M18 REDLITHIUM™ XC4.0 battery for up to 20 tanks per charge in Mode 3, although actual runtime varies with application and operating conditions.
The SWITCH TANK™ architecture separates the powered base from the tank's pump, hose, and wand. This allows compatible tank assemblies to be exchanged for different spraying applications and helps reduce the risk of cross-chemical contamination.
Key Features
4-Gallon Capacity – Provides substantial liquid capacity for extended spraying tasks.
No Manual Pumping – The M18 battery-powered pump generates pressure automatically.
Up to 140 PSI – Provides high pressure for demanding professional spraying applications.
5-Mode Flow Adjustment – Adjusts liquid flow from 0.10 to 0.52 GPM.
Up to 20 Tanks per Charge – Rated with the included M18 REDLITHIUM™ XC4.0 battery when operating in Mode 3.
24-Foot Vertical Spray Distance – Provides extended reach for spraying elevated or hard-to-reach areas.
Interchangeable SWITCH TANK™ System – Allows compatible tank assemblies to be swapped onto the same powered base.
Isolated Pump, Hose, and Wand – Keeps application-specific fluid-contact components separate when using different tank assemblies.
Dual-Diaphragm Pump – Designed for durability and longer pump life.
Viton® Seals – Provides increased resistance to harsh chemicals.
Optimized Tank Design – Helps distribute the load for improved carrying balance.
Wide-Mouth Opening – Makes filling and pouring easier.
Integrated Strainer – Filters debris before it can enter the tank system.
High-Visibility Tank Markings – Makes fluid-level management easier.
Tank Identification Stickers – Help distinguish individual tanks when multiple chemicals or solutions are used.
Adjustable Padded Harness – Includes lumbar support and a padded hip strap for improved comfort during extended use.
Easy-Access Latches – Simplify tank and battery changes.
M18 Battery Platform – Uses Milwaukee M18 REDLITHIUM™ batteries.
Instant, Constant, Adjustable Pressure
The 3019-21PS eliminates the repetitive manual pumping associated with conventional backpack sprayers. Its powered system maintains consistent pressure while the operator controls output through the five-mode adjustment system.
The available flow settings range from 0.10 to 0.52 gallons per minute, allowing users to select a lower output for controlled applications or a higher setting when greater coverage is required. Maximum operating pressure is 140 PSI.
Interchangeable SWITCH TANK™ Design
The Milwaukee SWITCH TANK™ system consists of two primary components:
M18 Powered Base with SWITCH TANK™
4-Gallon Sprayer Tank Assembly with SWITCH TANK™ – 49-16-19PS
The powered base contains the motor, battery compartment, and REDLINK™ electronics. The interchangeable tank assembly contains the pump, hose, and wand.
Because the fluid-handling components are isolated from the powered base, users can add compatible tank assemblies for different spraying applications. This design is particularly useful when separate tanks are needed for different chemicals because the pump, hose, and wand remain dedicated to the tank assembly.
Durable Tank and Pump Construction
The 4-gallon sprayer tank is equipped with a dual-diaphragm pump designed for longer pump life. Critical seals use Viton® material to improve durability when exposed to harsh chemicals.
A wide-mouth tank opening simplifies filling, while the integrated strainer helps prevent debris from entering the pump. High-visibility markings assist with monitoring the amount of liquid in the tank.
Comfortable Backpack Design
The backpack frame is designed to distribute the tank's weight across the user's body. The current model features padded shoulder straps, lumbar support, and a padded hip strap, helping improve comfort during longer spraying sessions.
An integrated handle also makes the unit easier to transport and store when it is not being worn.
Compatible Tank Assemblies
The M18 powered base can be used with compatible SWITCH TANK™ assemblies, allowing one powered base to serve multiple applications.
Compatible assemblies listed by Milwaukee include:
49-16-19PS – 4-Gallon Sprayer Tank Assembly
49-16-19WS – 4-Gallon Water Supply Tank Assembly
The sprayer and water-supply systems are designed for different applications. Milwaukee specifically states that water-supply accessories are not compatible with pesticide sprayer tanks, and pesticide-sprayer accessories should not be used with water-supply tanks.
What's Included
The 3019-21PS kit includes:
M18™ Powered Base with SWITCH TANK™ – 3019-20
4-Gallon Sprayer Tank Assembly with SWITCH TANK™ – 49-16-19PS
M18™ REDLITHIUM™ XC Extended Capacity Battery – 48-11-1828
M18™ & M12™ Multi-Voltage Charger – 48-59-1812
Backpack Sprayer Hose Handle and Wand Assembly
Sprayer nozzles
Product Specifications
| Specification | Details |
|---|---|
| Brand | Milwaukee |
| Product Type | Cordless Backpack Sprayer Kit |
| Model / Catalog No. | 3019-21PS |
| Product System | M18 SWITCH TANK™ |
| Tank Capacity | 4 gallons |
| Maximum Pressure | 140 PSI |
| Flow Rate | 0.10–0.52 GPM |
| Pressure / Flow Control | 5 modes |
| Vertical Spray Distance | Up to 24 ft |
| Pump Type | Dual diaphragm |
| Critical Seal Material | Viton® |
| Tank Design | Interchangeable |
| Powered Base | 3019-20 |
| Sprayer Tank Assembly | 49-16-19PS |
| Included Battery | M18 REDLITHIUM™ XC Extended Capacity |
| Battery Model | 48-11-1828 |
| Charger | M18 & M12 Multi-Voltage Charger |
| Rated Runtime | Up to 20 tanks per charge in Mode 3 |
| Harness | Adjustable padded harness with lumbar support and padded hip strap |
| Tank Features | Wide-mouth opening, strainer, high-visibility markings |
| Fluid-Handling Components | Isolated pump, hose, and wand |
| Battery Platform | Milwaukee M18 |
| Intended Use | Professional landscape maintenance and spraying applications |
Specifications are based on Milwaukee's current product information for model 3019-21PS and the corresponding 49-16-19PS tank assembly.
Recommended Applications
The Milwaukee M18 4-Gallon Backpack Sprayer is suitable for professional applications including:
Landscape maintenance
Lawn and turf treatment
Chemical spraying
Weed-control applications
Insect-control applications
Fungicide applications
Commercial grounds maintenance
Agricultural and horticultural spraying where the selected chemical and equipment are approved for use
Always verify that the chemical being applied is compatible with the sprayer, seals, tank assembly, and applicable local requirements.
Maintenance and Chemical Management
Proper cleaning is especially important when changing chemicals or storing the sprayer. Milwaukee recommends cleaning the sprayer before storage and when switching chemicals, and keeping the filter clean and installed before use for proper operation.
The interchangeable tank design provides an additional advantage: separate tank assemblies can be dedicated to different chemical applications, helping minimize cross-chemical contamination.
Important Compatibility Note
The 3019-21PS should not be confused with the older 2820-21PS M18 SWITCH TANK™ 4-Gallon Backpack Sprayer Kit. Milwaukee's current 3019-21PS uses the newer 49-16-19PS tank assembly and provides up to 140 PSI, while the older 2820-21PS was specified at up to 120 PSI and used the earlier 49-16-28PS tank assembly.
For replacement parts and additional tanks, match the assembly to the correct SWITCH TANK™ generation and powered base.
Why Choose the Milwaukee 3019-21PS?
The Milwaukee M18 4-Gallon Backpack Sprayer Kit with SWITCH TANK™ combines cordless operation, precise pressure control, and an interchangeable tank architecture into one professional spraying system. With no manual pumping, adjustable flow, a durable dual-diaphragm pump, Viton® seals, and an ergonomic backpack frame, it is designed to make extended spraying work more controlled and efficient.
For professionals who use different chemicals or perform multiple types of spraying work, the SWITCH TANK™ platform also provides the flexibility to maintain dedicated tank assemblies while sharing the same M18 powered base.