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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AstroAI Air Chuck, Heavy Duty Closed Flow Lock On Tire Chuck with Clip for Inflator Gauge Compressor Accessories, Yellow

AstroAI Air Chuck, Heavy Duty Closed Flow Lock On Tire Chuck with Clip for Inflator Gauge Compressor Accessories, Yellow

Product ID: 266892842

Details

Brand
AstroAI
Capacity
0.25 Inches
Compatible devices
Tire Inflator
Material
Brass
Thread size
1/2-20 UNC

🔒Lock-on clip for secure fit

🔧250 PSI heavy-duty brass

⚙️¼" female NPT thread

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Inflate Like a Pro, Lock It Down Like a Boss!

DOUBLE THE VALUE - Comes in a convenient 2-pack so you’re always ready, whether at home or on the go.
EFFORTLESS INFLATION - Straight tip design allows for quick, hassle-free tire filling, saving you time and frustration on the job.
SECURE LOCK ON DESIGN - The innovative locking clip keeps the chuck firmly attached to Schrader valves, eliminating air leaks and hassle during inflation.
UNIVERSAL COMPATIBILITY - Fits most inflators with standard ¼" female NPT threads, making it a versatile addition to your toolkit.
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.

The AstroAI Air Chuck is a heavy-duty, brass-constructed tire inflator accessory designed for professional-grade performance. Rated for up to 250 PSI, it features a secure lock-on clip compatible with Schrader valves and standard ¼" female NPT threads. Its straight tip ensures easy, leak-free inflation, and the 2-pack offers great value for both personal and professional use.

Specifications

ASIN	B078WVQL31
ASIN	B078WVQL31
Best Sellers Rank	#55,110 in Automotive ( See Top 100 in Automotive ) #40 in Automotive Tire Chucks
Brand Name	AstroAI
Capacity	0.25 Inches
Compatible Devices	Tire Inflator, Tire Gauge
Customer Reviews	4.5 4.5 out of 5 stars (4,937)
Customer reviews	4.5 4.5 out of 5 stars (4,937)
Date First Available	2 February 2018
Global Trade Identification Number	00767452943575
Handle Type	hand-tightened
Included Components	2 tire chucks
Is Discontinued By Manufacturer	No
Item Type Name	AstroAI Air Chuck, Heavy Duty Closed Flow Lock On Tire Chuck with Clip for Inflator Gauge Compressor Accessories, Yellow
Item model number	767452943575
Lock Type	Manual
Manufacturer	AstroAI
Manufacturer	AstroAI
Manufacturer Part Number	767452943575
Material Type	Brass
Model Number	767452943575
Product Dimensions	11.94 x 6.1 x 8.13 cm; 77 g
Thread Size	1/2-20 UNC
UPC	767452943575

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