Skip to content

Free Gift Card Details

$100 Order
$10
gift card
$250 Order
$25
gift card
$500 Order
$50
gift card
$1000 Order
$100
gift card
  • The promotion will be automatically applied on the Shopping Cart page.
  • To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
  • Free gift cards will be issued in the form of e-gift cards only, not physical gift cards.
  • E-gift cards will be sent to the email address used in your billing address when your order ships or is picked up.
  • Free e-gift cards expire 10/01/26.
  • Promo code not valid on prior purchases or on Honda and STIHL products and cannot be combined with other promotional offers.
  • Valid online and in participating retail stores.
  • Limited-time offer. Subject to change without notice.

Product Summary

The MILWAUKEE® M18™ 4-Gallon Backpack Sprayer w/ SWITCH TANK™ delivers the industry's best pressure control with no manual pumping and an interchangeable tank design. Designed to meet the needs of professional landscape maintenance, the battery-powered backpack sprayer provides instant, constant, and adjustable pressure up to 140 PSI and a 24ft. vertical spray distance. The 5-mode flow rate knob adjusts the flow by 0.1 – 0.52 GPM, giving you the capability to complete a wide range of applications. Our M18™ REDLITHIUM™ XC3.0 Battery (sold separately) provides you with up to 20 tanks of spraying per charge (on Mode 3). The 4-Gallon Sprayer Tank Assembly features a dual diaphragm pump for longer pump life and Viton® seals for increased durability against harsh chemicals. The sprayer tank has an optimized design for better weight distribution, a wide mouth opening for easier pouring, and a strainer that filters debris from getting into the tank. The backpack frame includes padded straps, lumbar support, and a hip belt, giving you added comfort during extended spraying applications. The 4-Gallon Sprayer is made up of two components – the M18™ Powered Base and the 4-Gallon Sprayer Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK™ electronics, while the interchangeable Tank Assembly includes the pump, hose, and wand. The isolated pump, hose, and wand design allows you to add on tank assemblies for different spraying applications, eliminating cross-chemical contamination. The Powered Base is compatible with the 4-Gallon Water Supply Tank Assembly (49-16-19WS). Our M18™ 4-Gallon Backpack Sprayer w/ SWITCH TANK™  is part of the M18™ system, which is fully compatible with over 275 tools.

What's Included

    (1) Powered Base (1) Tank Assembly

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

AttributeSpecification

item#

6569951

Brand

Milwaukee

Manufacturer's Warranty

3 year limited warranty

Ship Weight

20.75 LB

Tank Size

4 Gal
AttributeSpecification

Flow

0.52 GPM

Pressure

140 PSI

Product Weight

17.4000 lb

Dimensions L x W x H (in.)

10.5 x 15.0 x 22.5 in

Warranty

Manufacturer's Warranty

3 year limited warranty

Extend Your Warranty Coverage with a Northern Protection Plan (NPP)

Replacement Plan — 1 Year

A Northern Protection Plan is available after adding the product to your shopping cart.