Milwaukee 2820-20PS M18 4Gal Sprayer, Bare w/ FREE 48-11-1850 M18 Battery Pack

Sale price$ 299.00 Regular price$ 829.35


• (1) M18 SWITCH TANK Powered Base
• (1) 48-11-1850 M18 Redlithium XC 5.0 Extended Capacity Battery Pack
• (1) SWITCH TANK 4-Gallon Sprayer Tank Assembly
• (1) Stainless Steel Wand
• (1) Adjustable Nozzle
• (1) Fan Nozzle
• (1) Angled Nozzle Adaptor

• Interchangeable Tanks, No Manual Pumping
• Add-on and Interchange Tank Assembly to Eliminate Cross-Chemical Contamination
• Replaceable Tank Assembly Delivers Lower Cost of Ownership
• Instant, Constant and Adjustable Pressure for Ultimate Control
• Up to 120 PSI & 25' Spray Distance
• Run-time: Up to 12 tanks per charge with M18 REDLITHIUM XC3.0 Battery
• Critical seals: Viton for increased durability against chemicals
• Dual Diaphragm Pump: For Longer Pump Life
• Wide Mouth Opening and Strainer: For Easier, Debris Free Pouring
• Wide Straps for Comfort During Extended Duty Cycles
• Transport Handle for Convenient Transport and Storage

• Length: 10"
• Height: 21.75"
• Width: 13"
• Weight: 16.7

The MILWAUKEE M18 SWITCH TANK 4-Gallon Backpack Sprayer delivers the industry’s first interchangeable tank design with no manual pumping. Designed to meet the needs of professional landscape maintenance, the battery-powered backpack sprayer delivers instant, constant and adjustable pressure up to 120 PSI and a 25 ft spray distance. The 5-mode pressure adjustment knob adjusts the pressure between 20 – 120 PSI for a wide range of applications. The M18 REDLITHIUM XC3.0 Battery (sold seperately) provides up to 12 tanks of spraying per charge. The sprayer has a dual diaphragm pump for longer pump life and Viton seals for increased durability against harsh chemicals. The sprayer tank has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. The backpack frame has wide straps for added comfort during extended spraying applications and a handle for convenient transport and storage.

The 4-Gallon Sprayer is made up of two components – the M18 SWITCH TANK Powered Base and the SWITCH TANK 4-Gallon Sprayer Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK electronics. The interchangeable Tank Assembly includes the pump, hose, and wand. The isolated pump, hose, and wand design allow different tank assemblies to be added for different spraying applications, eliminating cross-chemical contamination. It also allows the tank assembly to be replaced at a lower cost of ownership compared to replacing the entire sprayer. The Powered Base is compatible with the SWITCH TANK 4-Gallon Concrete Sprayer (49-16-28CS) and 4-Gallon Water Supply (49-16-28WS) Tank Assemblies. The M18 SWITCH TANK 4-Gallon Backpack Sprayer is part of the M18 system which is fully compatible with over 175 tools.

Customer Reviews

Based on 4 reviews
Charles Boyd

Not good so far . The tank leaked right out of the box . One customer representative at the red tool store sent a label and stated as soon as they could see it was on the way back they would ship out a new one . When I called back to let them know it was picked up and got another customer support person they said they would have to receive the defective one first before sending me one . That will take over three weeks from when I first ordered it . The people at the red tool store needs to get on the same page .

E. T.
Milwaukee 2820-20PS 4 gallon sprayer

Just got it, So far not good, I can spit father than this thing can spray, going to take it to a repair store to have it checked out, not good right out of the box!


When I ordered the Milwaukee sprayer, I was having problems with my 9 gal. chemical sprayer. I fixed my sprayer Sunday and the Milwaukee sprayer arrived last Monday. when I arrived home, I contacted the shipping company and asked them to return it because it repaired my sprayer. The shipping company advised to contact the store where I purchased the sprayer from but I had problem with my computer and lost the contact info for your store. I have not opened the box and would like to return it. Please advise...

H. W. Carneal

I haven't been able to use the tool as of yet

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