Milwaukee 2820-21PS M18 SWITCH TANK 4-Gallon Backpack Sprayer Kit

Milwaukee Model: miln2820-21ps
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Milwaukee 2820-21PS M18 SWITCH TANK 4-Gallon Backpack Sprayer Kit Milwaukee Model: miln2820-21ps

Product Features & specs :

M18 SWITCH TANK 4-Gallon Backpack Sprayer features interchangeable tank design


Tank structure is interchangeable that the pump, hose and wand is isolated, separating wearable parts from the M18 SWITCH TANK Powered Base (battery and charger sold separately)

M18 SWITCH TANK 4-Gallon Backpack Sprayer boasts pressure up to 120 PSI

Spraying Power

Immediate, continuous and customizable pressure up to 120 PSI and a spray distance of 25 ft. (battery and charger sold separately)

M18 SWITCH TANK 4-Gallon Backpack Sprayer features wide straps for comfort during extended duty cycles

Ease of Use

Backpack features large straps to provide support during extended work periods (battery and charger sold separately)

Milwaukee 2820-21PS M18 SWITCH TANK 4-Gallon Backpack Sprayer Kit

Get instant, consistent and adjustable pressure with no manual pumping using the Milwaukee 2820-21PS M18 SWITCH TANK 4-Gallon Backpack Cordless Pesticide Sprayer. This unique backpack sprayer features the battery powered base and backpack frame that powers interchangeable tank, pump and wand assemblies. This allows users to dedicate tank assemblies to specific types of chemicals, ensuring they are not mixing herbicides with pesticides or fungicides with fertilizers. All pesticide tank assemblies use Viton seals to ensure extra protection against seal degradation and a dual diaphragm pump that delivers up to 120 PSI. 5 adjustable pressure settings help users spray up to 25 ft. away. Because this backpack sprayer can spray up to 12 tanks on a single REDLITHIUM XC 3 Ah battery pack, wide padded straps help ensure comfort.
  • Interchangeable tank design allows users to add on tanks as needed, saving money and preventing cross-contamination when using different chemicals
  • Dual diaphragm pump with 5 modes adjust pressure from 20 - 120 PSI and propels chemicals up to 25 ft.
  • Delivers constant and instant spray with no manual pumping
  • Viton seals in tank assembly protect against harsh chemicals
  • Wide tank opening with strainer aids in pours and keeps debris out
  • Adjustable nozzle, fan nozzle and angled nozzle help users spray chemicals right where they're needed
  • Backpack frame features wide, padded straps for comfort during longer jobs
  • Sprays up to 12 tanks per charge when using a REDLITHIUM XC 3 Ah Lithium-Ion battery pack
  • Compatible with all M18 REDLITHIUM Lithium-Ion batteries
What’s Included:
  • M18 SWITCH TANK Backpack Sprayer Powered Base - 2820-20
  • (1) SWITCH TANK 4-Gallon Pesticide Tank Assembly - 49-16-28PS
  • (1) Hose, Handle and Stainless Steel Wand Assembly - 49-16-2727
  • (1) M18 REDLITHIUM XC 3 Ah Lithium-Ion Battery - 48-11-1828
  • M18 / M12 Multi-Voltage Lithium-Ion Battery Charger - 48-59-1812
  • (1) Adjustable Nozzle
  • (1) Fan Nozzle
  • Angled Nozzle Adapter
Seal Type
Power Source
Stainless Steel
Tank Capacity
4 gal
4 gal
Included Nozzles
Batteries Included
Battery Type
Case Included
Bluetooth Compatibility
Motor Type
Nozzle Type
Charger Included
Battery System
10.0 in.
13.0 in.
21.75 in.
16.7 lbs.
Warranty Term
3 Year

Reviews :

2.3 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I've owned this sprayer for about 6 months now and so far from what I can tell is that it is inconsistent. I am a pest control professional and this thing will leak... then not leak, then lose pressure and stop spraying completely... Then suddenly after hopping up and down, start up again (This works sometimes and other time is does not at all). I do not feel like I should have to be hopping around like a bunny to get a backpack sprayer to work. I have researched on the reviews for this backpack from many other sources and found that I am not the only one with issues. It would seem that there are even more issues that I have not even reached yet. I do not feel like this backpack is up to par to be consistent or durable enough to actually be used by a professional who will be spraying 8-12 houses a day.
June 25, 2020
Originally posted at
I would not purchase again to many issues.
lets just stick with the problems cause bottom line for the amount of money should not be having these issues: when the tank has about 1/2 gallon of product will not empty leaving product that can not be used, + the pressure is not consistent , ive used plenty other sprayers 1/3 of the price of this 1 and worked better
January 16, 2020
Originally posted at
I would buy again if they made it better
I have had mine for 2 weeks...found out the lid don't seal and ran a load of chemical down my back. The screen is inaccessible if there is any chemical in the tank..And the screen is TINY.... after the first week I had to hit the handle to make it pump...they need to talk with people who use it more than once a day....
September 10, 2019
Originally posted at
Great product for the HVAC Technician
We sell and use this product for coil cleaning and rinsing. It's great for carrying multiple cleaners without having to dump and rinse tanks. Great for commercial rooftops & VRF as well as residential heat pumps and a/c condensers.
May 2, 2019
Originally posted at

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