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Backpack Sprayer, 4 Gallon, Piston, Heavy-Duty View larger

425-HD Backpack Sprayer, 4 Gallon, Piston, Heavy-Duty





Model # 425-HD

Made in the USA

425-HD Backpack Sprayer, 4 Gallon, Piston, Heavy-Duty.


Rugged SOLO® backpack sprayers are flexible and ergonomically designed for virtually any spraying task both large and small.

Piston pump for liquid formulations.

Built for comfort. Built for convenience. Built to last. SOLO's ergonomic design contours to your back for greater comfort. With a proven piston pump, you will be reliably equipped for applying spray liquid or insecticides in your garden. A low number of wearing parts and sturdy technology ensure a long service life and minimum maintenance.

Highlighted Features

  • Designed with professional features throughout.
  • High-performance piston pump for liquid formulation.
  • Adjustable pressure regulator with four settings: 15, 30, 45, 60 psi.
  • Viton® seals in key locations for superior chemical resistance.
  • Extra large carrying handle with wand retainer for easy portability and storage.
  • Deluxe shoulder straps and waist belt for user comfort.
  • Rugged metal frame for stability when filling.
  • Extra-large tank openings for easier filling and cleaning.
  • 28" Unbreakable wand and shut-off valve for excellent reach.
  • Commercial shut-off valve with lock-on/lock-off feature to minimize user fatigue.
  • 48" nylon-reinforced high-pressure hose for extended reach.
  • Double filtration system: filter basket and nozzle filter.
  • Durable professional grade brass adjustable, brass fan, hollow cone, and jet stream nozzles. TeeJet® compatible.
  • No-drip check valve eliminates nozzle drip after pressure is released.

Sample Applications

  • Janitorial and sanitation industry
  • Building service
  • Restoration & remediation
  • Pest control


Comes with a wide variety of nozzle tips for all of your spraying needs:

  • Brass Adjustable
  • Brass Fan
  • Hollow Cone
  • Jet Stream

These nozzle sprays all come standard.

Accepts TeeJet® nozzle tips

Brass adjustable nozzle
Brass Flat Fan nozzle
Hollow cone nozzle
Jet stream nozzle

Viton® is a registered trademark of DuPont Dow Elastomers

TeeJet® is a registered trademark of TeeJet Technologies and Spraying Systems Co.

Horizontal Spray Distance25± feet
Vertical Spray Distance20± feet
Dry Weight11 lbs
Average Full Weight with 8lbs per gal. of Water43 lbs
Pump TypePiston
Ideal Chemical FormulationsLiquids
Max Pressure60 psi
Manual Pressure AdjustmentYes
Hose Length4 feet
Shut-off Valve & Wand Length2¼ feet
Trigger LockYes
Interchangeable NozzlesYes
Pressure Relief ValveNo
Inflation ValveNo
Pressure GaugeNot Standard
Pump LeverFixed
Carry StrapIndependent Straps
Waist BeltYes
Carry HandleYes
Tank MaterialHDPE
Hose MaterialNylon Reinforced PVC
Shut-off Valve & Wand MaterialPolypropylene
Warranty1 Year