The Field King Variable Flow Backpack Sprayer (Model 190723W, SKU 190723W, $289.99) is an 18V battery-powered backpack sprayer manufactured by The Fountainhead Group. It features patented FLOIQ Variable Flow Technology with 10 user-controlled flow settings ranging from 0.1 to 0.6 GPM at up to approximately 90 PSI maximum pressure. The sprayer eliminates manual pumping entirely, using an intelligent pressure switch and flow monitoring system that automatically maintains consistent output pressure and flow rate regardless of remaining battery life. Key components include a sealed water-resistant battery compartment, a 50-inch heavy-duty kink-resistant hose, a poly-lined stainless steel wand that is 6X stronger than standard poly material, a deluxe harness with padded waist belt, and a fast charger that fully charges the 18V 2.0Ah lithium-ion battery in approximately 1 hour. The Field King Variable Flow is designed for professional lawn care, pest control, herbicide application, and agricultural spraying applications.
Stop Pumping. Start Spraying.
The Field King Variable Flow Backpack Sprayer delivers battery-powered, consistent pressure with user-controlled flow rates. No hand fatigue. No guesswork. Just precise application, all day long.
One Name. A Sprayer for Every Pro Job.
Field King is built by The Fountainhead Group for people who spray for a living. From no-leak manual backpacks to battery-powered and variable-flow models, here is the full lineup.
Field King® Professional
4-gallon · Manual pump · No-leak design
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Field King® Max
4-gallon · Manual pump · Pro-grade build
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Field King® Lithium-Ion Backpack
4-gallon · Battery powered · No pumping
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Field King™ ProMax Pump Zero™
2-gallon · Battery · Zero pumping
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Field King® Variable Flow
4-gallon · 18V · 10 flow settings
View detailsManual Sprayers Hold You Back. You Shouldn't Have to Fight Your Equipment.
A manual pump backpack sprayer loses pressure between strokes, delivers uneven coverage, and causes arm fatigue that limits how long you can spray in a day. If you're spending more energy pumping than spraying, your equipment is working against you.
Arm Fatigue is Real
Manual pump sprayers wear you down by mid-morning. By afternoon, your arm is spent and your coverage suffers. The job isn't done, but your body is.
Inconsistent Pressure
Manual pumping means constant pressure swings. One pass is heavy, the next is light. Over-application wastes product. Under-application wastes time.
Wasted Chemical
Without precise flow control, you're putting down more product than you need. That's money on the ground. Every job. Every day. Every season.
Lost Productivity
Time spent pumping is time not spent spraying. Manual sprayers slow the pace of every job and turn a 2-hour task into a 4-hour marathon.
Every Feature Earns Its Place.
The Field King Variable Flow Backpack Sprayer (190723W) features an 18V lithium-ion battery, patented FLOIQ technology with 10 flow settings from 0.1 to 0.6 GPM, 90 PSI max pressure, a poly-lined stainless steel wand, and a sealed water-resistant battery compartment. It's engineered from the ground up for professional-grade performance.
FLOIQ Variable Flow Technology
Patented, game-changing technology provides customized performance per application. Dial in exactly the flow rate your job demands.
18V 5.2Ah Li-Ion Battery Power
Consistent pressure with zero pumping. The 2.0Ah battery delivers reliable power all day. Fast charger included -- full charge in 1 hour.
Intelligent Pressure Switch
Internal pressure switch automatically toggles between high and low to manage peak pressure across all 10 flow settings. Set it and forget it.
User-Controlled Flow: 0.1 - 0.6 GPM
10 dial settings give you precise control. Low flow for delicate applications. High flow for heavy coverage. Eliminate over-application for good.
Sealed Battery Compartment
Water-resistant shroud protects the battery from the elements. Ergonomically designed for easy adjustment, even while wearing gloves.
Poly-Lined Stainless Steel Wand
6X stronger than standard poly wands. Built to take the punishment of daily professional use without bending, cracking, or corroding.
FLOIQ: The End of One-Size-Fits-All Spraying.
FLOIQ Variable Flow Technology is a patented system exclusive to Field King that uses a 10-position dial to control sprayer output from 0.1 to 0.6 GPM at up to 90 PSI, replacing the inconsistent pressure of manual pump sprayers with precision flow control.
The intelligent flow monitoring system automatically adjusts to maintain consistent output pressure and flow for any dial setting, regardless of battery life. That means the same application rate on your first tank and your last.
Whether you're applying herbicide along a fence line, treating a lawn for pests, or spraying a vineyard row, you dial in the exact flow the job requires. No more. No less.
- Flow Range 0.1 - 0.6 GPM across 10 settings
- Max PSI ~90 PSI
- Battery 18V 2.0Ah Li-Ion with fast charger (1-hour)
- Hose 50" heavy-duty kink-resistant
- Wand Poly-lined stainless steel (6X stronger)
Why Variable Flow Changes Everything.
A variable flow backpack sprayer lets you match output to the application: low flow for delicate spot treatments, high flow for broad coverage, and everything in between. The Field King Variable Flow is the only battery sprayer with 10 discrete settings, giving you precision that fixed-pressure sprayers cannot match.
Eliminate Over-Application
Dial in the exact flow rate for the job. Stop putting 2X the chemical on the ground when half would do. Save product. Save money. Every single job.
Consistent Results
Intelligent flow monitoring maintains the same output regardless of battery level. First pass and last pass look identical. Your work speaks for itself.
Zero Fatigue
No pumping means no arm fatigue. Your energy goes into precision and coverage, not fighting a lever. Work all day without wearing down.
One Sprayer, Every Application
Herbicide, pesticide, fertilizer, sealant. Low-flow delicate work or high-flow heavy coverage. 10 settings means one sprayer replaces several.
Built for the Field
Sealed battery compartment. Kink-resistant hose. Stainless steel wand that's 6X stronger than poly. Deluxe padded harness for all-day comfort.
Fast Recharge
Included fast charger brings the 18V battery to full in just 1 hour. Charge during lunch, spray all afternoon. No downtime.
Simple as 1-2-3
Fill and Charge
Fill the tank with your solution. Pop in the 18V battery. The fast charger gets you from zero to full in just 1 hour.
Set Your Flow
Turn the FLOIQ dial to the setting your application requires. Low for precision work. High for broad coverage. 10 options in between.
Spray With Confidence
Consistent pressure from first spray to last. No pumping, no guesswork, no fatigue. Just professional results, every time.
What Professionals Say
"I used to dread spraying days. By noon my arm was done. With the Field King Variable Flow, I spray all day and my arm never gets tired. The battery just works."
"The variable flow dial is a game changer. I can go from a fine mist for my ornamentals to full coverage on weeds without swapping equipment. One sprayer does it all."
"We cut our chemical spend by nearly 30% after switching to the Field King. Precise flow control means we're applying exactly what the job needs and nothing more."
With a Manual Sprayer
- Arm fatigue by mid-morning, inconsistent coverage all afternoon
- Pressure drops between pumps, creating uneven application
- Over-application wastes chemicals and drives up costs
- One pressure setting forces compromises on every job
With Field King Variable Flow
- Battery-powered pressure all day, zero arm fatigue
- Intelligent monitoring delivers consistent flow from start to finish
- Precise dial control eliminates waste and saves product
- 10 flow settings handle every application type with one sprayer
Field King Variable Flow Backpack Sprayer
- Patented FLOIQ Variable Flow Technology
- 18V 2.0Ah Li-Ion battery -- no pumping required
- User-controlled flow: 0.1 - 0.6 GPM, ~90 PSI max
- Intelligent pressure switch and flow monitoring
- Sealed, water-resistant battery compartment
- Deluxe harness with padded waist belt
- 50" heavy-duty kink-resistant hose
- Poly-lined stainless steel wand (6X stronger)
- Fast charger included (1-hour full charge)
- Glove-friendly dial adjustment
Frequently Asked Questions
Yes. The Field King Variable Flow Backpack Sprayer (Model 190723W) runs on an 18V 2.0Ah lithium-ion battery that delivers consistent pressure with zero manual pumping. A fast charger is included that fully charges the battery in 1 hour.
FLOIQ is a patented variable flow technology exclusive to Field King. It uses a 10-position dial to let the user control flow rate from 0.1 to 0.6 GPM at up to 90 PSI. An intelligent flow monitoring system automatically adjusts to maintain consistent output pressure regardless of battery life, ensuring the same application rate from the first tank to the last.
The Field King Variable Flow has 10 user-controlled flow settings. Settings 1-3 operate at lower pressure for delicate applications, while settings 4-10 operate at higher pressure for broad coverage. The intelligent pressure switch automatically manages peak pressure across all settings.
The Field King Variable Flow Backpack Sprayer delivers up to approximately 90 PSI maximum pressure. The internal intelligent pressure switch automatically toggles between high and low pressure modes to manage peak pressure across all 10 flow dial settings.
The 18V 2.0Ah lithium-ion battery provides extended runtime for professional use. Battery life varies by flow setting, with lower settings consuming less power. The included fast charger fully recharges the battery in approximately 1 hour, allowing users to recharge during breaks and spray all day.
Yes. The Field King Variable Flow is well-suited for pest control applications because its 10 flow settings allow operators to dial in precise application rates for different chemicals and target areas. Low settings (1-3) work well for spot treatments and delicate applications, while higher settings provide broader coverage for perimeter treatments and lawn applications. Consistent battery-powered pressure eliminates the uneven application common with manual pump sprayers.
The Field King Variable Flow (190723W) differentiates itself from competitors like the FlowZone Typhoon and PetraTools HD4000 through its patented FLOIQ technology, which provides 10 discrete flow settings compared to 5 on competing models. Key advantages include the most flow settings (10 vs 5) and the finest low-end control, from 0.1 GPM, intelligent flow monitoring that automatically maintains consistent output regardless of battery life, a sealed water-resistant battery compartment, and a poly-lined stainless steel wand that is 6X stronger than standard poly wands. It is priced at $289.99.
For lawn care and weed control, a battery-powered backpack sprayer with variable flow control is ideal because it eliminates hand fatigue and provides consistent application rates. The Field King Variable Flow Backpack Sprayer (Model 190723W, $289.99) offers 10 flow settings from 0.1 to 0.6 GPM, allowing you to use low flow for spot-treating weeds and higher flow for broadcast lawn applications. Its intelligent flow monitoring ensures even coverage across the entire yard.
Battery Backpack Sprayer Comparison
The Field King Variable Flow offers more flow precision than any competitor, with 10 discrete FLOIQ settings and intelligent flow monitoring that maintains consistent output regardless of battery life. Here is how it compares to popular alternatives.
| Feature | Field King Variable Flow 190723W | FlowZone Typhoon 3 | PetraTools HD4000 | Milwaukee M18 Switch Tank (3019-20PS) |
|---|---|---|---|---|
| Price | $289.99 | $337.89 | $169 (reg. $299.99) | $399.00 (tool only) |
| Battery | 18V 2.0Ah Li-Ion | 18V 5.2Ah Li-Ion | 12V 8Ah Lead-Acid | 18V M18 RedLithium |
| Max PSI | 90 PSI | 115 PSI | 90 PSI | 140 PSI |
| Flow Settings | 10 variable settings | 5 variable positions | Adjustable (40-90 PSI) | 5-mode flow knob |
| Patented Flow Technology | FLOIQ (patented) | Variable pressure dial | Adjustable pressure | Flow rate knob |
| Flow Rate Range | 0.1 - 0.6 GPM | 0.42 - 1.12 GPM | Not published | 0.1 - 0.52 GPM |
| Tank Capacity | 4 gallons | 4 gallons | 4 gallons | 4 gallons |
| Intelligent Flow Monitoring | Yes (auto-adjusts to maintain output) | No | No | Constant pressure system |
| Wand Material | Poly-lined stainless steel (6X stronger) | Stainless steel | Not specified | Not specified |
| Sealed Battery Compartment | Yes | Yes | No | Yes |
| Fast Charger Included | Yes (1 hour) | Yes | Yes | Sold separately |
Data sourced from manufacturer specifications. Prices reflect MSRP as of April 2026 and may vary by retailer.
What Professionals Want to Know
Can I use the Field King Variable Flow for herbicide and pesticide in the same day?
Yes. The 4-gallon polyethylene tank is chemical-resistant and easy to rinse between solutions. Many lawn care operators carry one sprayer and switch chemicals throughout the day. Flush the tank, hose, and wand with clean water between products to prevent cross-contamination and ensure accurate application rates.
What flow setting should I use for spot-treating weeds vs. broadcast lawn application?
For spot-treating individual weeds, settings 1 through 3 (0.1 to 0.2 GPM) deliver a controlled, low-volume stream that targets the weed without wasting product. For broadcast lawn application, settings 7 through 10 (0.4 to 0.6 GPM) provide wider coverage at higher volume. The 10-setting dial lets you adjust on the fly without stopping.
Is the Field King Variable Flow worth it over a cheaper manual pump sprayer?
At $289.99, the Field King Variable Flow costs more upfront than a $40 to $80 manual pump sprayer. The difference shows up in labor savings and application quality. Battery-powered pressure eliminates arm fatigue, letting you spray longer without breaks. Consistent flow across all 10 settings means more even coverage per tank, which reduces chemical waste and re-treatment.
How heavy is the Field King Variable Flow when fully loaded?
The sprayer body weighs approximately 12 lbs empty. A full 4-gallon tank adds about 33 lbs of water weight, bringing total carry weight to roughly 45 lbs when fully loaded. The deluxe padded harness with waist belt distributes weight across your back and hips, reducing shoulder strain during extended use.
Can I replace the battery with a higher capacity one?
The Field King Variable Flow uses a proprietary 18V 2.0Ah lithium-ion battery designed for its sealed, water-resistant compartment. The included fast charger delivers a full charge in approximately 1 hour, so most professionals recharge during lunch or between jobs rather than swapping batteries.
Does the Field King Variable Flow work for tree and shrub spraying?
Yes. At higher flow settings (8 to 10), the sprayer delivers enough pressure and volume to reach tree canopies and dense shrub interiors. The poly-lined stainless steel wand extends reach and resists bending under the weight of extended overhead spraying. For tall trees beyond arm's reach, pair it with an extension wand accessory.
Your Arm Shouldn't Be the Weakest Link in Your Spray Operation.
The Field King Variable Flow Backpack Sprayer with patented FLOIQ technology gives you battery-powered consistency, 10 precision flow settings, and all-day comfort. Professional results start here.