Harbor Freight Tools


20V Cordless 4 Gallon Backpack Chemical Sprayer - Tool Only

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The BAUER™ 20V Cordless 4 gallon Backpack Chemical Sprayer sprays up to 40 gallons per charge* with no pumping.

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MILWAUKEE 2820-20PS at $299 Save $199.01

Available Online by Jun. 30

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Product Overview

The BAUER™ 20V Cordless 4 gallon Backpack Chemical Sprayer is easy to use, easy to handle and sprays up to 40 gallons per charge.* The rugged metal spray wand has a durable, long-lasting nozzle that quickly adjusts from spray to stream. The 53 in. flex hose provides a spray reach over 15 ft. Designed with an extra large, translucent tank to easily determine fluid level.

  • Sprays up to 40 gallons per charge*, gets more work done in less time with no pumping
  • Durable nozzle with adjustable spray pattern sprays over 15 ft. for wide area coverage
  • Ergonomic grip and trigger design for all day comfort
  • Extra large 4 gallon translucent tank provides a clear view of fluid level
  • Integrated backpack design with mesh back support and padded shoulder straps for maximum comfort
  • Integrated wand holster for one-hand use
  • Rugged metal hose frame for added protection
  • 90 PSI of constant pressure for great spray performance

Replacement Parts in Stock

Call to Order: 1-800-444-3353

Important Information

  • Tool only - BAUER™ 20V Lithium-Ion battery and charger sold separately. *40 gallons per charge using a 3.0 Ah battery or greater.


Accessories Included
Tank, wand, 53 in. hose, replacement seals
Battery type
Battery voltage (volts)
Battery(s) Included (y/n)
4 gallon
Hose Length
53 in.
Maximum pressure (PSI)
90 PSI
Product Height
21.6 in.
Product Length
12.6 in.
Product Weight
12.5 lbs.
Product Width
11.2 in.
Shipping Weight
13.67 lb.
Returns disclaimer
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change


We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.