How many gallons does it hold?

The tank holds 4 gallons when full; it has graduated markings of 1, 2, and 3 gallons also. When full, it weighs 50 pounds. The back pack makes it feel like less than that once you have it on your back. This is most easily done if you set it on a bench top or table top, and then "slip" into the harness.

Has anyone had any experience with using this sprayer for a stain or oil based product for spraying/staining a split rail fence?

use a $20.00 plastic cheaPO 1 gallon pump spray worth it for large deck saves serious time ive done this 5 plus times solvents and stayin etc usually ruin pump in hours make sure finish same day b/c next day pump might be junk

what is the difference bet 190328 and 190348

The 190328 Field King backpack has adjustable padded shoulder straps and durable poly wand; whereas, the 190348 Field King Max backpack has a deluxe padded harness with a full back pad, wide support waist belt and chest cinch strap. It also features a 21" poly-lined stainless steel wand and foldable pump handle making it easier to transport and store. They both have the internal No Leak pump, Viton seals, lockable shut-off with removable filter, and 4 nozzles. Please let us know if you have any other questions. You can also call us at 1-800-311-9903. Thank you for your interest in our products.

will it work for Organic fertilizers? Using Fertilizers that have some tiny solids.

I haven't used it for organic fertilizers but as long as the solids are soluble in water, it should work. If they are not soluble, they will likely clog up the spray head.

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🌿 Spray Smarter, Not Harder — The Pro’s Choice for Flawless Lawn Care

POWERFUL PRECISION - Delivers up to 150 PSI for professional-grade weed control that tackles tough lawns and gardens effortlessly.
LEAK FREE CONFIDENCE - Internal no-leak pump keeps chemicals off your back and hands, ensuring safer, cleaner application every time.
MAINTENANCE MADE EASY - Quick-access pump design lets you swap seals in minutes without tools, minimizing downtime and maximizing productivity.
VERSATILE SPRAY OPTIONS - Includes 4 nozzles—brass adjustable, 2 flat fans, and foaming—plus compatibility with Tee Jet nozzles for every spraying need.
DURABILITY MEETS CONVENIENCE - Premium brass components and Viton seals resist wear and chemicals, while the lockable shut-off prevents accidental sprays.

The Field King Professional 190328 Backpack Sprayer combines a no-leak internal piston pump with a powerful 150 PSI output, premium brass and Viton components, and versatile nozzle options. Designed for safe, efficient weed control, it offers tool-free maintenance and a lockable shut-off, making it the ultimate sprayer for serious lawn and garden professionals.

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Brand	Field King
Recommended Uses For Product	Weed Control
Material	Brass
Item Weight	5.81 kg
Style	Adjustable,Lockable
Power Source	Hand Powered
Included Components	nozzle
Model Name	190328
Maximum Pressure	1.5E+2 Pound per Square Inch
Hose Length	21 Inches
UPC	841688002586 094716169090 657819404606
Global Trade Identification Number	30841688002587, 00841688002586
Country of Origin	USA
Item model number	190328
Product Dimensions	24.13 x 24.13 x 57.15 cm; 5.81 kg
ASIN	B000AYHKUO

Field King Professional 190328 No Leak Pump Backpack Sprayer for Killing Weeds in Lawns and Gardens

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