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Milwaukee 2820-21WS M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply Kit

Model: 2820-21WS Core Drills  |  Item Number: 282021WS
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Reg. Price: $650.00 $449.00
CARB Compliant Power Equipment

Estimated Ship Date for New Orders: 12/9/2023

Features for the Milwaukee 2820-21WS Core Drills

Our M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply kit delivers the industry’s first interchangeable tank design with no manual pumping. Designed to meet your water supply needs for concrete cutting and coring, the battery-powered water supply delivers instant, constant, and adjustable pressure up to 60 PSI. The 5-mode pressure regulator adjustment knob adjusts the pressure between 20 – 60 PSI for ultimate control. The M18™ REDLITHIUM™ XC3.0 Battery provides you with up to 12 tanks of water delivery per charge. The 4-gallon water supply tank features a dual diaphragm pump for increased durability and longer pump life. 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 and a handle providing you with convenient transportation and storage. The 4-Gallon Water Supply is made up of two components – the M18™ SWITCH TANK™ Powered Base and the SWITCH TANK™ 4-Gallon Water Supply Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK™ electronics, while the interchangeable Tank Assembly includes the pump, 10ft hose, and quick-connect. The isolated pump, hose, and quick-connect 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 water supply. The Powered Base is also compatible with the SWITCH TANK™ 4-Gallon Concrete Sprayer (49-16-28CS) and 4-Gallon Sprayer (49-16-28PS) Tank Assemblies. The M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply is part of the M18™ system which is fully compatible with over 175 tools. In addition to the backpack water supply, the kit includes one M18™ REDLITHIUM™ XC3.0 Battery and an M18™/M12™ Multi-Voltage Charger.

Add-On, Replace and Interchange SWITCH TANK™ Concrete Sprayers and Water Supply Tanks.

Compatible with SWITCH TANK™ Concrete Sprayer and Pesticide Tank Assemblies.

Instant, Constant and Adjustable Pressure for Ultimate Control.

Interchangeable Tanks, No Manual Pumping.

OSHA Table 1 Compliant when Concrete Cutting and Coring.

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

Strainer to Filter Debris.

Up to 12 Tanks Per Charge.

Up to 60 PSI.

Wide Mouth Opening for Easier Pouring.

Wide Straps and handle for convenient transport and storage.


(1) M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply Kit(2820-21WS)

(1) SWITCH TANK™ 4-Gallon Water Supply Tank Assembly(49-16-28WS)

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

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

(1)10ft Hose w/ Quick-Connect

(1) Water Spray Nozzle w/ Quick-Connect


Voltage 18V

Power Source: Cordless

Length: 10 in

Weight: 18.45 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 2820-21WS Core Drills*

* 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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