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Milwaukee 2820-21CS M18™ SWITCH TANK™ 4-Gallon Backpack Concrete Sprayer Kit

Model: 2820-21CS Sprayers  |  Item Number: 282021CS
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Reg. Price: $650.00 $472.00
CARB Compliant Power Equipment

Estimated Ship Date for New Orders: 7/27/2024

Features for the Milwaukee 2820-21CS Sprayers

Our M18™ SWITCH TANK™ 4-Gallon Backpack Concrete Sprayer kit delivers the industry’s first interchangeable tank design with no manual pumping. Designed to meet the needs of concrete contractors, the battery-powered concrete sprayer delivers instant, constant, and adjustable pressure up to 120 PSI and a 25 ft spray distance. The 5-mode pressure adjustment knob allows you to adjust the pressure between 20 – 120 PSI, delivering the capability to complete a wide range of applications. The M18™ REDLITHIUM™ XC3.0 Battery provides you with up to 12 tanks of spraying per charge. The 4-Gallon Concrete Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton® seals for increased durability against harsh chemicals. The tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. The backpack frame includes wide straps giving you added comfort during extended spraying applications and a handle for convenient transport and storage. The 4-Gallon Concrete Sprayer is made up of two components – the M18™ SWITCH TANK™ Powered Base and the SWITCH TANK™ 4-Gallon Concrete Sprayer Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK™ electronics while the interchangeable Tank Assembly includes the pump, hose, and wand. The isolated pump, hose, and wand design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. It also provides you with the ability to replace the tank assembly at a lower cost of ownership compared to replacing the entire sprayer. The Powered Base is also compatible with SWITCH TANK™ 4-Gallon Sprayer (49-16-28PS) and 4-Gallon Water Supply (49-16-28WS) Tank Assemblies. Our M18™ SWITCH TANK™ 4-Gallon Backpack Concrete Sprayer is part of the M18™ system which is fully compatible with over 175 tools. In addition to the backpack concrete sprayer, the kit includes one M18™ REDLITHIUM™ XC3.0 Battery and an M18™/M12™ Multi-Voltage Charger.

Add-on and Interchange Tank Assembly to Eliminate Cross-Chemical Contamination.

Dual Diaphragm Pump: For Longer Pump Life.

Instant, Constant and Adjustable Pressure for Ultimate Control.

Interchangeable Tanks, No Manual Pumping.

Replaceable Tank Assembly Delivers Lower Cost of Ownership.

Run-time: Up to 12 tanks per charge with M18™ REDLITHIUM™ XC3.0 Battery.

Transport Handle for Convenient Transport and Storage.

Up to 120 PSI & 25' Spray Distance.

Viton® Seals for increased durability against chemicals.

Wide Mouth Opening and Strainer: For Easier, Debris Free Pouring.

Wide Straps for Comfort During Extended Duty Cycles.


(1) M18™ SWITCH TANK™ Powered Base (2820-20)

(1) SWITCH TANK™ 4- Gallon Concrete Sprayer Tank Assembly(49-16-28CS)

(1) M18™ REDLITHIUM™ XC Extended Capacity Battery (48-11-1828)

(1) M18™ & M12™ Multi-Voltage Charger (48-59-1812)

(1) Stainless Steel Wand

(1) Adjustable Nozzle

(1) Fan Nozzle

(1) Angled Nozzle Adaptor


Voltage: 18V

Power Source: Cordless

Length: 10 in

Weight: 18.3 lbs.

Height: 21.75 in

Width: 13 in

Battery System: M18

This product may contain chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. For more information, go to

Technical Specs for the Milwaukee 2820-21CS Sprayers*

* These Technical Specs are provided by the manufacturer at the beginning of the model year. Please be aware that the manufacturer may decide to change these specs at any given time without notice.

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