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

Product ID: 266892842

Details

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

📏Heavy duty straight tip with locking clip

🔧¼" female NPT thread universal fit

🔩250 PSI rated brass durability

¥5365

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Description

🚀 Lock, Inflate, Dominate: The Pro’s Choice for Tire Inflation

DUAL PACK CONVENIENCE - Two premium air chucks included to keep your garage or worksite ready
UNIVERSAL FEMALE NPT THREADS - Seamlessly fits most inflators for instant compatibility
LOCK ON CLIP FOR HANDS FREE INFLATION - Securely locks onto valve stems to prevent air leaks and slips
BUILT TO LAST WITH 250 PSI BRASS POWER - Engineered for heavy-duty inflation without compromise
CLOSED FLOW DESIGN FOR EFFICIENT AIR DELIVERY - Optimizes airflow only when valve is open, saving time and effort

The AstroAI Air Chuck is a heavy-duty, brass-constructed tire chuck rated for up to 250 PSI, designed for professional-grade inflation tasks. Featuring a closed flow design and a locking clip, it ensures secure, leak-free attachment to Schrader valves. Its ¼" female NPT threads provide broad compatibility with most inflators, making it an essential accessory for both automotive pros and serious DIYers. Sold in a convenient two-pack, it’s built to streamline your tire maintenance routine with durability and precision.

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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¥5365

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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