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 20004 SureSpray 1-Gallon Pump Sprayer for Lawn, Garden & Weeds | See fluid levels at a glance; the funnel top makes filling easier, while the adjustable nozzle and 34-in hose extend reach

Product ID: 673947

Details

Brand
CHAPIN
Color
Translucent
Material
Polyethylene
Recommended Uses For Product
Fertilizer
Tank Volume
1 gallons

💧1-gallon translucent tank for easy fluid monitoring

💪Lightweight 2 lb polyethylene tank with ergonomic pump handle

🔧Adjustable cone nozzle with 34-inch flexible hose

¥21182

Duties & taxes included

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Spray Smarter, Not Harder — Your Garden’s New MVP!

STAY LEAK FREE CLEAN - Modular design with replaceable seals ensures no mess, no leaks, and easy maintenance.
PROUDLY USA MADE QUALITY - Backed by a 1-year warranty and US-based support, built to last and perform.
SEE YOUR PROGRESS INSTANTLY - Translucent tank lets you monitor fluid levels at a glance—no surprises, just results.
EFFORTLESS PRECISION SPRAYING - Switch seamlessly between targeted streams and broad sprays for ultimate garden control.
PUMP WITH COMFORT WORK LONGER - Ergonomic handle reduces fatigue so you can tackle bigger projects without burnout.

The CHAPIN 1-Gallon Pump Sprayer combines a durable, lightweight polyethylene tank with an ergonomic pump handle and adjustable nozzle, delivering precise, leak-free spraying for weed control, fertilizing, and cleaning. Its translucent design allows easy fluid monitoring, while the 34-inch hose and modular build ensure versatile, comfortable use. Made in the USA and backed by a 1-year warranty, it’s the professional’s choice for efficient lawn and garden care.

Specifications

ASIN	B000E28UQU
Best Sellers Rank	#9 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #1 in Lawn & Garden Sprayers
Brand Name	CHAPIN
Color	Translucent White
Customer Reviews	4.4 4.4 out of 5 stars (103,268)
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	2.5"W x 15.25"H
Item Type Name	Pump Sprayer, 1-Gallon
Item Weight	2 pounds
Manufacturer	Chapin International
Manufacturer Part Number	20004
Manufacturer Warranty Description	1-year limited
Material Type	Polyethylene (PE)
Maximum Pressure	60 psi
Model Name	20004
Model Number	20004
Number of Items	1
Number of Packs	1
Power Source	manual
Recommended Uses For Product	Fertilizer, Pest Control, Spraying Plants, Lawns, Watering, Weed Control
Style Name	1 Gallon
Tank Volume	1 gallons
UPC	023883200008 023883200046
Unit Count	1 Count

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