Field King 4-Gallon Backpack Sprayer 190328 — Internal No-Leak Pump, 150 PSI, Viton Seals

The FIELD KING 190328 is a 4-gallon professional backpack sprayer with an internal no-leak pump that delivers up to 150 PSI for heavy-duty spot and broadcast spraying.

This sprayer pairs a high-pressure internal piston pump and quick-change Viton seals with a comfortable backpack chassis and a variety of nozzles, letting you handle herbicides, wettable powders and water-soluble solutions without soaking your clothes. Built-in wand storage, a pressure regulator, and a lockable comfort grip make it practical for landscape pros, farmers, and homeowners who need precision and durability in one unit.

How does the internal no-leak pump protect me while I spray?

The pump is housed inside the tank so chemical drips and seal failures won’t run down your back or soak straps. That internal placement also shortens the body profile and reduces snag points when you move through tight spaces.

• Enclosed piston pump design prevents external leakage onto the operator.
• Viton seals resist many chemicals and are replaceable without tools.
• Pump reaches up to 150 PSI for long-reach applications.

What nozzle options come with the sprayer and what can they do?

Six different nozzles arrive with the unit so you can change spray patterns and flow rates to match tasks from foaming to targeted jets. The wand also accepts common TeeJet nozzles, expanding compatibility with industry-standard tips.

• Adjustable brass nozzle for stream-to-cone control and durability.
• Wide flat fan (red) for low-volume broadcast at 0.25 GPM and 70° angle.
• Narrow flat fan (yellow) for precise, low-volume 30° coverage.
• High-volume wide fan (brown), jet stream (orange), and foaming (black) for specialized tasks.

How comfortable and durable is it for long jobs?

The pack is built with padded, adjustable shoulder straps, a waist belt and a chest cinch to distribute weight and reduce fatigue. A molded carry handle and wand storage integrated into the tank keep tools accessible and protect the wand during transport.

• Padded straps and waist belt for balanced load-bearing during extended use.
• Built-in wand slot prevents bending and keeps the workspace tidy.
• 21-inch poly wand resists corrosion while reaching into dense planting.

How easy is maintenance and seal replacement?

Serviceability is designed into the pump: the access is fast and tool-free, letting you swap Viton seals in minutes so downtime is minimized. An in-line removable filter helps reduce nozzle clogging and prolong component life.

• Tool-free access to the pump for quick seal changes.
• Viton seals compatible with many chemical types for longer service intervals.
• Removable in-line filter protects nozzles from debris and sediment.

Who is this for: The FIELD KING 190328 backpack sprayer suits landscapers, growers, and homeowners who require a portable sprayer with professional-level pressure and chemical resistance. It’s a good match for tasks that need higher PSI or varied spray patterns — from spot treatments and perimeter spraying to applying foams and water-soluble products — while keeping the operator cleaner and reducing downtime thanks to easy-maintenance features.