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

Milwaukee Model: miln2820-20ps
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Milwaukee 2820-20PS M18 SWITCH TANK 4-Gallon Backpack Sprayer (Tool Only) Milwaukee Model: miln2820-20ps
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Product Features & specs :

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


Interchangeable tank design isolates the pump, hose and wand, separating wearable components from the M18 SWITCH TANK Powered Base

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


Instant, constant and adjustable pressure up to 120 PSI and a 25 ft spray distance

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


Backpack features wide straps for comfort during extended duty cycles

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

Get instant, consistent and adjustable pressure with no manual pumping using the Milwaukee 2820-20PS 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 (sold separately), 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 (sold separately)
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)Adjustable Nozzle
  • (1) Fan Nozzle
  • (1)Angled Nozzle Adapter
  • Battery and charger sold separately
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 :

4.3 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Really like the sprayer until it gets low
Fast sprayer that is compatible with all my m18 batteries. Really enjoy using until it gets low. Most other reviews say it works until the last 1/2 gallon, from what I see that estimate is about right. Email support to see if there was any pointers to correct this... never heard back. To me, the flaw is where the pickup strainer is located. Leaning back helps but it's very uncomfortable to use this way. I'm slightly under 6' and tend to lean due to length of the sprayer wand. Think most users are doing the same as they use this.
August 6, 2020
Originally posted at
Best electric backpack sprayer on the market hands down.
July 17, 2020
Originally posted at
As a HVAC service provider I bought one of these to clean indoor evaporator coils. There is enough pressure turned all the way up to clean coils, but the fan tip for this application could be a bit 15-20 degrees. Other than the tip I'd give it a 5 star.
June 12, 2020
Originally posted at
Great Tool
Great sprayer, strongly recommend if you already use m18 tools. They put some great ingenuity into this tool, really impressed.
May 1, 2020
its ok
I purchased this by accident for the Concrete saw that I purchased and I realized that it docent come with the attachment to connect to the saw so I had to order another tank that cost me another 200$
March 20, 2020
Really like being able to take the tank off to clean. I got 5.0 batteries and they last
January 10, 2020
good value
much better than any other backpack unit i have used. when full it is a bit heavy to get on your back (use a table or the tailgate of you truck) but once you have it on and adjusted correctly most of the weight is supported by the waist belt. the only real issue is the tank does not drain very well in use, i have to loosen the shoulder harness and allow the top to drop back away from my shoulders to use the last half gallon.
September 6, 2019
Downfalls to consider
The spray is a quality peace of equipment. The downsides are the sprayer thinking the tank is empty with a half gallon left in the tank, the sprayer wand is straight which is very awkward if you need to spray the top of plants taller than a 12 inches, and its weight I struggle to get it on my back unless it is on the truck tailgate or a table.
July 18, 2019
This sprayer is by far the best that I ever purchased. I have pump sprayers ,back pack sprayers and tow sprayers After using this Milwaukee sprayer I will never use anything else. Don't be afraid to buy You won't be disappointed
July 15, 2019
Long battery life on 5.0 xc, went through multiple tanks with weed killer around ditches and trees on property. Easy to use and powerful sprayer. Convienent straps on backpack make it comfortable to wear.
July 3, 2019

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