Does this unit have a "release pressure valve" (used for expelling air safely from container before opening)?

No. It does not have a release valve. You have to turn the handle to release the pressure. Use caution if you are using dangerous chemicals as it can blow back at you.

Could we use this to spray pesticides as mist? If yes, then how can we do that setting as I tried, but couldn't find such setting of nozzle.

I wanted it to mist too, but couldn't get it to do that. Even if you adjust the nozzle to spray as opposed to stream, it's still not exactly a fine mist.

Does anyone know how many SQFT two gallons will cover?

It will vary based on the product you are using so read the directions carefully for every product you spray. But in general, 1 gallon for 1,000 sq. ft. That said, I just used it on a lawn bowling green which is about 14,000 sq. ft. The pesticide I used said 1 gallon to cover 1,000 sq. ft. That would have been 12 gallons to cover the green, but when I had finished I used half that amount. This may have been because I walked too fast (I walked about the pace I do when I spread fertilizer). So, depending on how fast you walk, how comprehensive you want your coverage to be, and what the pesticide label suggest, I would say 1 gallon covers at least 1,000 sq. ft and at most 2,000 sq. ft. I also recommend using a dye/colorant so you can tell where you have sprayed and how think the coverage is.

Where is it made? China?

China/USA, either way..horrible product. Brand new from the box and wouldn't spray even a drop. Absolute waste.

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🌿 Spray smarter, not harder — your garden’s new MVP!

CLOG FREE PRECISION - SureSpray filter keeps your workflow smooth with zero downtime.
ERGONOMIC POWER PUMP - Comfortable handle and simple pump action for fatigue-free spraying.
VERSATILE GARDEN ALLY - Perfect for weeds, fertilizers, pests, and delicate indoor plants alike.
EXTENDED REACH MASTERY - 12-inch wand and 34-inch hose let you spray hard-to-reach spots effortlessly.
TRUSTED AMERICAN CRAFTSMANSHIP - Proudly designed and supported in the USA with a 1-year warranty.

The Chapin 20000 1-gallon lawn and garden sprayer combines durable American design with a clog-resistant SureSpray filter, ergonomic pump handle, and versatile adjustable nozzle. Its 12-inch extension wand and 34-inch hose provide extended reach, making it ideal for tackling weeds, fertilizing, pest control, and watering indoor or outdoor plants. Lightweight, translucent, and backed by a 1-year warranty, it’s the professional’s choice for efficient garden care.

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Color	Translucent White
Size	1 Gallon Sprayer
Style	Sprayer with Adjustable Cone Nozzle
Height	15 inches
Length	7.38 inches
Weight	5 Pounds
Width	7.38 inches
Material Type	Polypropylene (PP)
Number of Items	1
Power Source	Hand Powered
Features	Manual Opening, Portable
Tank Volume	3.8 Gallons
Included Components	12-inch poly extension wand, 34-inch PVC hose, adjustable cone nozzle
Batteries Included?	No
Brand	CHAPIN
Manufacturer	Chapin International
Item model number	20004
Product Dimensions	19.38 x 19.38 x 38.74 cm; 920.79 g
ASIN	B000E28UQU

CHAPINLawn, Garden and Multi-Purpose Sprayer with Adjustable Nozzle

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