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

🚀 Lock in Pressure, Unlock Performance!

EFFORTLESS TIRE FILLING - Heavy-duty straight tip design streamlines air flow for quick, precise tire inflation every time.
UNIVERSAL COMPATIBILITY - Standard ¼" female NPT threads fit most inflators and gauges, making it the perfect accessory for your compressor setup.
BUILT TO LAST UNDER PRESSURE - Heavy-duty brass components rated for up to 250 PSI ensure durability and reliability for all your tire inflation needs.
DOUBLE THE VALUE DOUBLE THE CONVENIENCE - Includes 2 bright yellow chucks so you’re always ready for any tire inflation task, whether at home or on the go.
SECURE LOCK ON FOR HASSLE FREE INFLATION - Innovative closed flow lock-on chuck with clip keeps the chuck firmly attached to Schrader valves, eliminating air leaks and freeing your hands.

The AstroAI 2 Pack Air Chuck features heavy-duty brass construction rated for 250 PSI, a closed flow lock-on design compatible with Schrader valves, and universal ¼" female NPT threads. Designed for professional-grade tire inflation, this set includes two durable yellow chucks with locking clips for secure, hands-free operation and hassle-free air flow.

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
Maximum Operating Pressure	250 Pound per Square Inch
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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