FIELD KING 190328 Backpack Sprayer, 4 Gallon, with Internal No Leak Pump Design Delivers 150 PSI

The Field King 190328 is a 4-gallon backpack sprayer designed for applying liquid chemical solutions and wettable powders. Built around an internal piston pump capable of producing up to 150 PSI, it suits property owners and maintenance tasks that demand higher pressure without chemical leakage during operation.

Safety and versatility drive the construction. The internal pump enclosure ensures liquids remain strictly inside the 4-gallon reservoir rather than dripping onto your clothing. Its 21-inch poly wand features Viton seals that withstand wettable powders as well as standard liquids, allowing one unit to perform duties typically requiring separate piston and diaphragm sprayers. Spray control is handled via a lockable shut-off assembly with brass components and an integrated in-line filter to prevent debris from clogging the flow.

Application choices are extensive thanks to six included nozzle attachments: an adjustable brass nozzle, a brown high-volume wide fan, a red low-volume wide fan, a yellow low-volume narrow fan, an orange jet stream, and a black foaming nozzle. The wand also accepts standard TeeJet nozzles. When maintenance is required, the easy-access pump design allows seal replacements in minutes without needing tools.

Trade-offs arise from the manual internal pump design, which requires consistent physical effort to maintain pressures up to 150 PSI. Additionally, maintaining the Viton seals over time is necessary to maintain leak-free performance. Verdict: The Field King 190328 is a practical choice for anyone needing a safe, highly customizable 4-gallon backpack sprayer that handles both liquids and powders without dripping onto the user.

• Capacity: 4 Gallons
• Maximum Pressure: Up to 150 PSI
• Pump Type: Internal piston pump with tool-free seal access
• Wand Details: 21-inch poly wand with Viton seals
• Shut-Off Valve: Lockable shut-off with brass components and in-line filter
• Included Nozzles: 6 (adjustable brass, high volume wide fan, low volume wide fan, low volume narrow fan, jet stream, foaming)
• Compatibility: Accepts standard TeeJet nozzles

A great fit if you:

• Need a safe 4-gallon backpack sprayer designed to keep chemicals from dripping onto your back
• Require a single sprayer that handles both wettable powders and liquid solutions
• Want multiple included nozzles for foaming, wide fan, narrow fan, and high-pressure jet spraying

Consider something else if you:

• Prefer a motorized or battery-powered pump system to avoid manual pumping
• Only need a tiny handheld mister for lightweight indoor plant care

What nozzles come included with this sprayer?
The sprayer comes with six specific nozzles: an adjustable brass nozzle, a high-volume wide fan (brown), a low-volume wide fan (red), a low-volume narrow fan (yellow), a jet stream (orange), and a foaming nozzle (black). It is also compatible with standard TeeJet nozzles.

Can this backpack sprayer be used with wettable powders?
Yes. The 21-inch poly wand is fitted with Viton seals, allowing you to use both liquid chemical formulas and wettable powders for all your spraying applications.

How do you access and change the pump seals during maintenance?
The sprayer features an easy-access internal pump design that allows you to replace worn seals in just a few minutes without using any tools.