Solo backpack sprayer

Solo backpack sprayer DEFAULT


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. The large filling aperture for convenient filling of the tank and smooth-running pump make spraying pleasant work.

The SOLO® 425, with a connecting rod-actuated piston pump, can produce a wide pressure range of up to 90 psi and is capable of performing virtually every spraying task. Easily and effectively handles liquid disinfectants, fertilizers, herbicides, pesticides and formulations for tree, shrub and plant protection.

Highlighted Features

  • The number one choice of landscapers in the USA.
  • Designed with professional features throughout.
  • High-performance piston pump for increased pressure capabilities.
  • 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.
  • Viton seals® in key locations ensure long service and durability.
  • Interchangeable pump handle for left or right-hand operation.
  • 48" nylon-reinforced high-pressure hose for extended reach.
  • Double filtration system: filter basket and nozzle filter.
  • Four-nozzle assortment for multiple spraying tasks: plastic adjustable, fan spray, hollow cone, and jet stream nozzles. TeeJet® compatible.

Sample Applications

Plant Protection

  • Large private gardens, decorative plants, shrubs and plantations
  • Public gardens and landscaping, greenhouses
  • Weed control
  • Agricultural crops

Woodland Maintenance

  • Plant care
  • Protection against game attack


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

  • Plastic Adjustable
  • Fan Spray
  • Hollow Cone
  • Jet Stream

These nozzle sprays all come standard.

Accepts TeeJet® nozzle tips

Viton® is a registered trademark of DuPont Dow Elastomers

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


Solo Backpack Sprayers

Solo Backpack Sprayers are well known for their:

COMFORT- Solo's unique shape and body fitting design balances weight between the shoulders and hips unlike competitors, where weight often presses on the small of the back. 48" hose, 28" wand assembly, easy pump, and easy trigger squeeze combine to make Solo Backpack Sprayers comfortable and easy to use.

-Solo Backpack Sprayers are constructed of high density polyethylene and other chemical resistant materials. A 2 year warranty is provided. Given proper maintenance, the sprayer should last for millions of pumps and many years of use.

-Each Solo sprayer is equipped with an Adjustable, Flat Spray, Hollow Cone, and Jet Stream Nozzle to accommodate virtually every spraying need. Padded Straps with pull tabs make adjustments quick and easy. Built-in Strainers, Screens, and Filters help keep debris out of nozzles. Unbreakable wand prevents damage common to brass and brittle plastic wands. Viton seals, gaskets and O-rings provide excellent Chemical Resistance and durability.
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Which Type of Solo Backpack Sprayer Should You Buy?

Piston Sprayersare designed for chemicals mixed from concentrated liquids. Wettable powders may scar the cylinder wall, Viton Collar and piston causing leaks and loss of pressure. Solo Piston Sprayers pump up to 90 PSI and are relatively simple to maintain.

Diaphragm Sprayers
are suitable for use with both wettable powders and liquid chemicals. Solo Diaphragm Sprayers will pump up to 60 PSI. Diaphragm Sprayers can be harder to maintain than Piston Sprayers.
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Solo SO425/P White Comfort Backpack Sprayer 15Ltr (7533J)

Handle TypePlastic Handle
Litre Capacity15 Ltr
Manufacturer Guarantee2 Year Manufacturer's Guarantee (T&Cs Apply)
Model NameSO425/P
Pack Size1
Parent ColourWhite
Pieces in Pack/Case1
Product Height520 mm
Product TypeComfort Backpack Sprayer
Product Width370 mm
Total Product Weight4.5 kg

Product contents

Pressure sprayer, LX lever, 3 x discs, 1 x screw, 1 x nut, spray tube, tank lid, tank plug with o-ring, hollow cone nozzle and 3 x contents labels.


Frequently Asked Questions Regarding Solo Backpack Sprayers

Since its launch into the market in the 1960's, the SOLO backpack sprayer has retained its pleasing appearance, efficiency and ergonomic design. While little has changed in the sprayer's physical appearance, it has undergone many significant changes in functional efficiency, materials and durability.

Often poorly imitated, the SOLO backpack sprayer maintains its worldwide leadership role through adherence to quality and performance standards that are widely envied. SOLO offers customers a wide choice of products and features including a choice of pump.

Do I need to buy a sprayer with a piston pump or a diaphragm pump?

The answer to this depends upon what you intend to use the sprayer for. As a rule of thumb: if you spray down, use the diaphragm pump it has a lower pressure with less drift and is good for weed killing. If you spray up, especially with a spray lance extension, use the piston pump, it has a higher pressure and produces smaller droplets, giving better coverage and canopy penetration. If you want to know more then read our article What Are The Main Differences Between A Solo Piston Pump And A Solo Diaphragm Pump Backpack Sprayer?

Will the plastic material last?

Yes. Only high-density polyethylene is used. The material is chosen for high density, high impact strength and excellent resistance to chemicals and stress. Ultraviolet inhibitors are used in the material to reduce deterioration caused by sunlight.

Is the sprayer comfortable to carry?

SOLO sprayers are probably the most comfortable spraying equipment on the market. The tank rests against the operator's back and the straps are made from a padded nylon webbing. The straps are easily adjusted within seconds. The pump lever is positioned at the most convenient height and can be varied with adjustment of the straps.

Can I use weedkiller and insecticide in the same sprayer?

In theory, you can if the sprayer is thoroughly cleaned out with a 1:25 ammonia/water solution. In practice, the use of both types of chemicals in the same unit is not recommended as the risk to the plants can be high. Use caution when handling any type of chemical and when cleaning your sprayer.

What spray nozzle should I use?

A flat spray nozzle is supplied for spraying paths, garden beds and for general area spraying. A cone nozzle is also supplied for spot spraying and for treatment of bushes and small trees. Other nozzles, such as a plastic or brass adjustable nozzles are also available. These nozzles can be set from very fine spray to a stream.

Can I spray for weeds between crops or ornamentals?

Yes, it is possible with the use of a spray drift guard and good care. SOLO offers an oval drift guard with a flat spray nozzle fitted. This is ideal for inter-row work or for killing weeds along fence lines.  There is also a smaller, round and translucent pro-spot guard which is excellent for spotting round weeds, such as thistles or dandelions.

What can I do to prevent drift while spraying insecticides or pesticides?

Follow the instructions of the chemical manufacturer for the safe use of their products at all times. Only spray when it is safe to do so i.e. when it is not windy! For best results spray early in the morning or at dusk when there is less air movement.

Can I do spot spraying?

Yes. The shut-off valve on SOLO sprayers is well suited for spot spraying. It is almost effortless! The handle incorporates a clip which holds the trigger valve open for area spraying without tiring the operator's hand. A pressure gauge may be added to the shut-off valve to control the output pressure.

Does the sprayer require constant pumping?

No. The well-designed lever action greatly reduces the pumping effort. The pressure cylinder within the tank has a hydraulic effect. Liquid from the pump compresses air in the pressure chamber, which allows irregular pumping action, yet results in steady spray at the nozzle.

Can the spray tank stand the pressure?

Yes. Although quite strong, the spray tank itself is intended only as a container for the spray solution. Pressure is maintained in a separate pressure chamber. This chamber is injection molded and built to withstand normal operating pressure.

How can I know how much I am spraying?

The output of the sprayer should be checked by collecting and measuring the spray liquid emitted during one minute. Maintain steady pumping on the pump handle while measuring. Having determined the output from the nozzle in litres per minute (l/min), the rate per unit area (l/ha) treated can be calculated knowing the spray width (m) and walking speed (km/h).

Volume (l/ha) =              600 x nozzle output (l/min)

                                                Speed (km/h)  x spray width (m)

Click to see our range of Solo Backpack Sprayers.


Sprayer solo backpack

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