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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Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White

Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White

Product ID: 90257508

Details

Brand
CHAPIN
Colour
Translucent
Material
Polyethylene
Recommended uses for product
Watering Pest
Tank volume
1 Gallons

💧1-gallon translucent tank

🔧Anti-clog SureSpray filter

🇺🇸Made in USA quality

Description

🌿 Spray smarter, not harder — garden like a pro with Chapin!

EXTENDED REACH - 12-inch poly extension wand plus 34-inch hose means no plant is out of reach.
DURABLE RELIABLE - Built with rust-free polyethylene and backed by a 1-year warranty to outlast competitors.
CLOG FREE PERFORMANCE - SureSpray filter keeps dirt and debris from interrupting your workflow—less downtime, more done.
ERGONOMIC PUMP HANDLE - Comfort-first design for effortless pumping and easy carrying during long gardening sessions.
PRECISION SPRAY CONTROL - Adjustable cone nozzle lets you dial in the perfect stream or shower for every garden task.

The Chapin 20000 is a 1-gallon, USA-made lawn and garden pump sprayer featuring a translucent polyethylene tank for easy fluid monitoring, an ergonomic pump handle for comfort, and a SureSpray anti-clog filter to ensure consistent spraying. Equipped with a 12-inch extension wand and adjustable cone nozzle, it offers precision and reach for watering, pest control, and fertilizing. Durable, reliable, and backed by a 1-year warranty, it’s designed to keep your garden thriving with less hassle.

Specifications

ASIN	B000E28UQU
Best Sellers Rank	51,445 in Garden ( See Top 100 in Garden ) 225 in Garden Sprayers
Brand Name	CHAPIN
Colour	Translucent White
Country Of Origin	USA
Customer Reviews	4.4 4.4 out of 5 stars (83,045)
Global Trade Identification Number	00023883200008
Hose Length	34 Inches
Included Components	Poly Extension Wand, PVC Hose, Adjustable Cone Nozzle, Ergonomic Pump Handle
Item Dimensions W x H	19.4W x 38.7H centimetres
Item Type Name	1 Gallon Lawn
Item Weight	2 Pounds
Manufacturer	Chapin International
Manufacturer Part Number	20004
Manufacturer Warranty Description	Manufacturer
Material Type	Polyethylene (PE)
Maximum Pressure	60 Pound per Square Inch
Model Name	Chapin 20000
Model Number	20004
Number of Items	1
Number of Packs	1
Power Source	Hand Powered
Recommended Uses For Product	Watering, Pest Control, Weed Control, Fertilizer sprayer
Style Name	Sprayer with Adjustable Cone Nozzle
Tank Volume	1 Gallons
UPC	023883200008 023883200046
Unit Count	128.0 millilitre

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