Milwaukee specifies flushing the SWITCH TANK by adding water to the tank and spraying it out; pump‑only or external‑hose flushing methods are not manufacturer‑recommended.
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Milwaukee M18™ SWITCH TANK™, M18 4-Gallon Backpack Sprayer w/ SWITCH TANK, Tank Size 4 Gal, Flow 0.52 GPM, Pressure 140 PSI, Model# 3019-21PS

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- Instant, Constant and Adjustable Pressure for Ultimate Control
- Add-on Interchangeable Tank Assembly to Eliminate Cross-Chemical Contamination
- Run-time: Up to 20 tanks per charge with M18™ REDLITHIUM™ XC3.0 Battery on Mode 3
- Adjustable padded harness with lumbar support and padded hip strap for added comfort
- Optimized design for better weight distribution
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Description
Key Specs
Reviews
Q & A
Warranty
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Product Summary
What's Included
- (1) Powered Base & Tank Assembly (1) Battery & Charger
Downloads
Features + Benefits
- Instant, Constant and Adjustable Pressure for Ultimate Control
- Add-on Interchangeable Tank Assembly to Eliminate Cross-Chemical Contamination
- Run-time: Up to 20 tanks per charge with M18™ REDLITHIUM™ XC3.0 Battery on Mode 3
- Adjustable padded harness with lumbar support and padded hip strap for added comfort
- Optimized design for better weight distribution
- Dual Diaphragm Pump: For Longer Pump Life
- Critical seals: Viton® for increased durability against chemicals
- Wide Mouth Opening for Easier Pouring
- High visibility tank markings for easy fill management
- Tank identification stickers for easy tank identification
- Easy access latches for quick battery and tank swaps
- Compatible Tank Assemblies: 4-Gallon Water Supply (49-16-19WS) & 4-Gallon Backpack Sprayer (49-16-19PS)
Key Specs
| Attribute | Specification |
|---|---|
item# | 6583032 |
Brand | Milwaukee |
Manufacturer's Warranty | 3 year limited warranty |
Ship Weight | 24.4 LB |
Tank Size | 4 Gal |
| Attribute | Specification |
|---|---|
Flow | 0.52 GPM |
Pressure | 140 PSI |
Product Weight | 18.9000 lb |
Dimensions L x W x H (in.) | 10.5 x 15.0 x 22.5 in |
Reviews
Questions & Answers
Questions
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· 4 months ago
Is there a way to flush the pump and hose without filling a tank with water?
1 answer-
ProductExpert29· 4 months ago
Helpful?
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· a year ago
Can you use bleach
1 answer-
ProductExpert11· a year ago
The sprayer is not recommended to be used with bleach, caustic (alkali) self heating, or corrosive (acid) liquids. Use of these substances will corrode the metal components and weaken the tank and hose.
Helpful?
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· a year ago
how big a battery will fit in this unit. will a 6 amp forge work with it?
1 answer-
ProductExpert11· a year ago
The sprayer is compatible with the entire M18 battery system.
Helpful?
-
Warranty
Manufacturer's Warranty
3 year limited warranty
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Specifications
4 Gal
4 Gal
4 Gal
2.1 Gal
0.52 GPM
0.25 GPM
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-
140 PSI
150 PSI
90 PSI
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18.9000 lb
11.3500 lb
lb
18.7 lb
10.5 x 15.0 x 22.5 in
15.0 x 8.75 x 22.25 in
14.5 x 9.25 x 20.0 in
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Viton
Viton
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22 ft
25 ft
29.5 ft
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Variable
4 ft
18 ft
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Flat Fan, Foaming Fan, Stream/cone
Multiple
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-
21 in
20 in
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-
Internal Piston
Piston
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50 in
48 in
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See All Milwaukee Backpack Sprayers
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