Solo Backpack Sprayer 15L Model 425LC - Professional Manual Pressure Sprayer

Solo #425 Professional Backpack Manual Pressure Sprayer (15L)

The Solo #425 is the industry-standard backpack sprayer, renowned worldwide for its "built to last" German engineering and uncompromising performance. As the flagship of the SOLO range, this 15-liter unit is designed for users who need to cover large areas or handle heavy-duty agricultural chemicals. Featuring a high-performance piston pump, it can generate up to 90 PSI, allowing for a broader reach and finer atomization of liquids. Whether you are a professional landscaper, a farmer, or a serious property owner, the #425 provides the perfect balance of rugged durability, ergonomic comfort, and precision application.

Best For Professional contractors and acreage owners who require a high-capacity, high-pressure sprayer for the frequent application of herbicides, pesticides, and fertilizers over large areas.

Key Features

• Piston Pump Technology: Capable of reaching high operating pressures (up to 6 bar/90 PSI), making it ideal for tall trees, dense foliage, and using specialized nozzles.

• 15L UV-Stabilized Tank: A large-capacity, heavy-duty polyethylene tank that is impact-resistant and protected against the degrading effects of harsh sunlight.

• Chemical Resilience: Specifically engineered with high-grade Viton seals to handle aggressive agricultural chemicals, including RoundUp, fungicides, and liquid fertilizers.

• Ergonomic Backpack Design: Features padded shoulder straps and a contoured tank shape designed to sit comfortably against the back, reducing strain during long periods of use.

• Left or Right-Hand Operation: The pump lever can be mounted on either side, catering to both left and right-handed users for maximum comfort and efficiency.

Specifications

• Brand: SOLO (German Made)

• Capacity: 15.0 Liters

• Pump Type: Piston Pump

• Max Pressure: 6.0 Bar (90 PSI)

• Wand Length: 50cm heavy-duty plastic lance

Ideal For (Uses)

• Large-Scale Weed Eradication: Managing acreage fence lines and firebreaks using high-strength herbicides like No Grow 500 Gold or Tree Killer.

• Agricultural Crop Care: Applying fungicides or insecticides (like Liquid Carbaryl) to orchards, vineyards, or large vegetable plots.

• Pasture Improvement: Spot-treating invasive woody weeds or applying selective herbicides over large lawn areas.

• Horticultural Feeding: Distributing Troforte Liquid Plant Food across expansive garden beds or nursery stock efficiently.

Pro Tip: To maintain the high pressure of the piston pump, apply a small amount of silicone grease to the piston o-ring annually. This ensures a smooth pumping action and prevents the seals from wearing prematurely. Always de-pressurize the unit and rinse the tank thoroughly after using thick or "sticky" fertilizers to prevent the internal valves from clogging.

Oversized Item Delivery Options

Oversized, heavy, and structural goods ship via specialist freight. Freight is calculated at checkout from estimated packaged volumetric or physical weight. Carrier depot audits may adjust the rate — if the increase exceeds 10%, we will contact you before processing.

Available options include:

✔ Delivery to your closest depot for pickup — default method
✔ Direct delivery — requires an operational forklift on site unless Tailgate Delivery has been specifically requested and quoted (contact us — this cannot be selected at checkout)
✔ Tailgate hydraulic lift delivery — must be specifically requested; contact us for a quote (not available as a checkout option; extra fees apply; required if you do not have a forklift)
✔ Forklift loading at our warehouse (no extra charge if you arrange your own freight)
✔ Direct truck delivery (available in Victoria)

Important Notes:

• Shipping costs vary by location and method
• Any carton or consignment over 25–30kg (or over 200cm) must be palletised
• Without a specifically requested and paid Tailgate Delivery quote, palletised freight requires a forklift on site — otherwise the carrier will redirect to the nearest depot
• Bulky and oversized items cannot be delivered to a PO Box — provide a physical street address
• Failed deliveries, locked gates, unattended sites, or incorrect business/forklift declarations may incur carrier redelivery, demurrage, and restocking fees as set out in our Terms & Conditions

Business Delivery:

• Selecting a business/commercial delivery rate warrants that the address has an operational forklift and certified operator during business hours
• If the carrier cannot unload, the consignment may be redirected to a depot and secondary fees may apply
• Additional fees may apply for failed delivery attempts due to lack of appropriate unloading equipment

See our Terms & Conditions (Article 8) for full freight and delivery rules.

Important Note on Availability & Shipping

Our warehouse is a logistics hub, not a retail showroom. Listing a product online does not mean it is stored at our Thomastown warehouse — many lines ship from supplier hubs (split fulfilment may apply).

How lead times work:

• Product page ETA: The Estimated Time of Arrival (ETA) / lead-time badge shown on the product page at checkout is the agreed delivery timeframe for that order under Australian Consumer Law.
• Metro baselines: Advertised ETAs apply to standard metropolitan zones. Regional and remote addresses may take longer and may attract surcharges.
• Peak seasons: Orders in March–May, August–October, EOFY (June), Black Friday/Cyber Monday (November), and Christmas/New Year (December–January) may automatically add a 2–4 week buffer beyond the product page ETA.
• Supplier-dependent / backordered items: If stock is delayed, we will notify you with a revised ETA. You then have 7 days to accept the new timeframe or cancel for a full refund.
• Adloheat: Custom-made products from Adloheat (Pakenham, VIC) may take 4–12 weeks depending on the order.

Full fulfilment, cancellation, and freight rules are in our Terms & Conditions.

Biosecurity & Interstate Shipping Restrictions

Due to strict state biosecurity regulations, we are unable to ship some products to certain states and territories:

• Potting Mixes cannot be shipped to Western Australia (WA), the Northern Territory (NT), or Tasmania (TAS).
• Seeds cannot be shipped to Western Australia (WA).

Orders placed for these items to restricted states will be cancelled and refunded. It is the customer's responsibility to ensure that the items being ordered can lawfully be delivered to their state or territory.