What is the difference, open flow and closed flow?

Lot's of info here that may confuse most. Open flow for hand held tire inflators or small 12v pumps. Allows the air to flow both directions, aka if your inflator has a pressure gauge and manual valve to let the air out of the hose. Closed flow is for direct connect to a compressor where you want the air to stop when you disconnect it, as in a shop or gas station. Both open the valve step to allow the air to flow.

will this work on presta valves?

no from what i read you would need an adepter

Im filling air tanks. Will i have to hold lever down or will it lock in open position?

If you are filling via a Schrader valve you will have to lock it on the valve otherwise it will not fit on the valve. Once on the valve you do not have to hold it down.. It least that has been my experience. I have been pleased with how these work. I bought mine to use on a Jaco inflator tool after the Jaco chuck failed. Not sure how it would hold up under commercial use. I use mine around the shop maintaining lawn equipment and personal vehicle tires for the last year

I am making a harness to deflate/inflate all 4 tires simultaneously. When I connect the first one to a valve stem, are the other 3 closed, or leak?

They should only flow (to deflate/inflate) when they are engaged to a valve. If you scroll down on the photos, they actually have one that describes open vs closed. My first purchase I didn't pay enough attention and order "open" ones and they leaked thru. Then I ordered the closed ones and they have worked great since.

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Description

🚀 Inflate Like a Pro, Lock It Down with AstroAI!

SECURE LOCK ON CLIP - Keeps the chuck firmly attached to Schrader valves, eliminating air leaks and hassle.
DUAL PACK CONVENIENCE - Two vibrant yellow chucks included—always have a backup or share the power.
UNIVERSAL COMPATIBILITY - Fits most inflators with standard ¼" female NPT threads for seamless integration.
BUILT TO LAST WITH 250 PSI BRASS POWER - Heavy-duty brass components engineered for professional-grade tire inflation.
CLOSED FLOW DESIGN FOR EFFICIENT AIRFLOW - Ensures smooth, uninterrupted inflation when the internal valve is open.

The AstroAI 2 Pack Air Chuck features heavy-duty 250 PSI rated brass construction with a secure lock-on clip designed for Schrader valves. Its closed flow design and ¼" female NPT threads ensure compatibility with most inflators and gauges, making tire inflation effortless and reliable. This dual pack offers professional-grade durability and convenience, perfect for any tire maintenance toolkit.

Specifications

Brand	AstroAI
Recommended Uses For Product	Tire Inflation
Power Source	Corded Electric
Special Feature	Heavy Duty
Included Components	2 tire chucks
Item Weight	3.84 Ounces
Maximum Power	0.2 Horsepower
Color	Yellow
Material	Brass
Product Dimensions	4.7"L x 2.4"W x 0.63"H
Motor Horsepower	0.2 Horsepower
Model Name	Air Chuck Closed Flow
Manufacturer	AstroAI
UPC	767452943575
Global Trade Identification Number	00767452943575
Part Number	767452943575
Item Weight	3.84 ounces
Item model number	767452943575
Is Discontinued By Manufacturer	No
Size	Closed
Item Package Quantity	2
Special Features	Heavy Duty
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 Year Warranty

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