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Milwaukee  |  SKU: 2820-20PS  |  Barcode: 045242526949

Milwaukee 2820-20PS M18 SWITCH TANK 4-Gallon Backpack Sprayer (Tool Only)

Rated 3 out of 5
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$299.00 $508.00

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Description

Milwaukee 2820-20PS Description

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.

Milwaukee 2820-20PS Includes

  • (1) M18™ SWITCH TANK™ Powered Base
  • (1) SWITCH TANK™ 4-Gallon Sprayer Tank Assembly
  • (1) Stainless Steel Wand
  • (1) Adjustable Nozzle
  • (1) Fan Nozzle
  • (1) Angled Nozzle Adaptor

Milwaukee 2820-20PS Features

  • 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

Milwaukee 2820-20PS Specifications

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

Performance Driven Solutions

M18 tools synergize power, weight, and performance as the new standard for cordless tools. Designed for professionals with ergonomic and comfortable for extended use on the job.

Trade Focused Innovation

M18 tools focus on key features for ease of use to efficiently finish each job ranging from easy set up for repetitive actions to customizable modes to unique one-handed operation features.

System Wide Compatibility

The M18 tool system has over 200 tools and counting. Each is fully compatible with an array of M18 REDLITHIUM Batteries that fit the job at hand.

IMPORTANT: This item cannot be accepted for a return unless it is unused and in its sealed original packaging. Please contact your local Milwaukee service center for repair or replacements of this item post purchase.

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171 Ratings
3.0out of 5 stars
171 Ratings

Rated 5 stars by 33% of reviewers

Rated 4 stars by 11% of reviewers

Rated 3 stars by 9% of reviewers

Rated 2 stars by 18% of reviewers

Rated 1 star by 29% of reviewers

1-10 of 163 Reviews
Rated 1 out of 5
Jun 30, 2025
Do not buy
Garbage. I sell Milwaukee tools and use them personally. This one is junk.
Rated 1 out of 5
Jun 28, 2025
Tank leaks
Tank leaks after very little usage with no easily apparent way to repair other than replacing entire tank. Looks at reviews this seems to be a very common issue. Would not purchase this product again!
Rated 2 out of 5
Jun 26, 2025
My only Milwaukee took I WOULD NOT recommend!
When I first purchased the switch tank I liked it so much that I went and purchased a few extra tanks for different applications each day. My love for this sprayer quickly diminished as it leaked horribly. As one of my products was total vegetation ground clear, you can imagine this did not go well for me. Other applications were water based mulch dye products which made a few huge messes as well. Needless to say after spending hundred on this unit, it has since been replaced with cheaper, more reliable sprayers and sitting in my garage unused for a few years now. I can't even fathom purchasing the newer version after all the money and wasted time I've put into this unit. Unfortunate because I have all Milwaukee cordless tools and have been extremely satisfied with all of them even with heavy, daily use.
Rated 1 out of 5
Jun 22, 2025
Unfortunate Lemon of the Line
Bought this backpack sprayer and it leaked herbicide all over my back and legs. Took it into our local Milwaukee store and they replaced it. Unfortunately the second one did the exact same thing. This is obviously a lemon of a machine and we are now stuck with it as they won't replace it again. Milwaukee really should have recalled this product or replaced them with the new model for clients. Their tools are expensive but usually worth it. Very disappointed this part of their line doesn't match up.
Rated 1 out of 5
Jun 21, 2025
Leaks down your lower back and pants. Ruins your d
Bought to use with my organic tea spray in my garden. Used twice.

Started leaking down my back. The tank or hoses or something leaks behind the black plastic cover on the tank.

I am glad it was not a chemical. That’s would be dangerous and not cool.

Milwaukee needs to redesign this. Could be a great tool.
Rated 2 out of 5
Jun 20, 2025
Convenient, But...
Backpack style is much more convenient than lugging handheld tanks around yard. Bought with two tanks, one for herbicides and one for pesticides. Have experienced two major deficiencies. The motor control system has failed twice and had to go through process to have Milwaukee replace the tanks. Second deficiency is that the valve assembly in spray wand develops bad leak drenching hand and wasting mixture. My garage is full on red Milwaukee products and this is the first to be a disappointment.
Rated 1 out of 5
Jun 16, 2025
Dissapointed Milwaukee Owner
I too have many Milwaukee tools and was excited to recieve the back pack sprayer as a Christmas gift. To my surprise when I used it for the first time this spring it leaked, Glad I checked the website to find many others haveing the same issue
Rated 1 out of 5
Jun 15, 2025
Disappointed
I have three tanks- two leak and are now also frozen. I can't get them to spin. I flush them out after every use. Also, the wand tip broke and I can't find a replacement wand. These tanks get very little use- I have a weekend home where I use them- they don't get daily use and they are essentially new. Please help
Rated 1 out of 5
Jun 14, 2025
Terrible.
Bought this sprayer about an week ago and the tank is already leaking thought the bottom. It won’t hold liquid long. Used it once. Very disappointed in this purchase.
Rated 1 out of 5
Jun 14, 2025
Sad product
I bought two of these and they are both leaking spray all over my back I spent this money because I thought Milwaukee was the best. I’m very disappointed with this product

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Milwaukee 2820-20PS M18 SWITCH TANK 4-Gallon Backpack Sprayer (Tool Only)
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Milwaukee 2820-20PS M18 SWITCH TANK 4-Gallon Backpack Sprayer (Tool Only)

$299.00 $508.00

Milwaukee 2820-20PS Description

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.

Milwaukee 2820-20PS Includes

  • (1) M18™ SWITCH TANK™ Powered Base
  • (1) SWITCH TANK™ 4-Gallon Sprayer Tank Assembly
  • (1) Stainless Steel Wand
  • (1) Adjustable Nozzle
  • (1) Fan Nozzle
  • (1) Angled Nozzle Adaptor

Milwaukee 2820-20PS Features

  • 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

Milwaukee 2820-20PS Specifications

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