Rainmaker 4 Gallon (16 Liter) Backpack Sprayer

Manual Pump Backpack Sprayer for Large Application Jobs, 4 Gallon

A hand-carried sprayer runs out of tank capacity fast once a job covers more than a small area, forcing frequent refill trips. The Rainmaker 4 Gallon (16 Liter) Backpack Sprayer moves that capacity onto the operator's back instead, using a manual pump mechanism and padded straps so larger jobs don't mean constant stops to refill a small hand sprayer.

At 4 gallons, this manual pump model suits growers who want backpack capacity without the added cost and battery maintenance of a powered sprayer.

Key Features & Benefits

• 4 interchangeable nozzles — swap spray patterns to match different applications.
• Lock-on trigger — enables continuous spraying without holding the trigger the whole time.
• Padded shoulder straps — supports comfortable backpack carry during longer jobs.
• Integrated filter — helps keep debris out of the pump and nozzle.
• 4 ft hose — extends reach from the tank to the spray wand.

Who Should Use This Sprayer

This sprayer fits growers and property managers who want backpack-scale tank capacity for herbicide, pesticide, or liquid fertilizer application without the cost or charging routine of a battery-powered unit. Growers wanting to skip manual pumping entirely should compare against the Rainmaker 5 Gallon Battery Powered Sprayer or 18 Volt Lithium Ion Backpack Sprayer instead.

About Rainmaker

Rainmaker manufactures both manual and battery-powered sprayers, along with matching spare parts kits, for herbicide, pesticide, and liquid fertilizer application across home and commercial use.

Frequently Asked Questions

Is this sprayer manual or battery powered?

It's a manual pump sprayer, requiring hand pumping to build and maintain spray pressure, unlike Rainmaker's battery-powered models.

What nozzles come with this sprayer?

It includes 4 interchangeable nozzles, letting growers switch spray patterns for different application needs.

Can I get replacement parts for this sprayer?

Yes, a Rainmaker Spare Parts Kit covering this model's lance assembly, O-rings, and spray tips is available separately.

How does the lock-on trigger work?

Engaging the lock-on trigger holds the spray flow open continuously, so the operator doesn't need to keep squeezing the trigger throughout a long application.

Why choose a manual sprayer over a battery-powered one?

A manual sprayer avoids battery and charger maintenance and typically costs less upfront, making it a straightforward option for growers who don't mind hand pumping during application.