Will they fit the 777 air connector?

Not sure what that is. Fits the H-3 short nipple 3/8. may can cross the numbers and check.

Does this fit and screw onto a schrader valve?

That coupler is made to go on an air hose and then you attach other air attachments to it, it’s not really made to go directly onto a Schrader although you can shove it onto a Schrader valve really hard and it will force air in but that is not recommended.

Are these automotive style "T" fittings?

they are standard industrial fittings used in most auto shops they work very well

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SUNGATOR 1/4-Inch Brass Female Industrial Coupler, 10-Pack NPT Female Quick Connector Air Coupler with Storage Case

SUNGATOR 1/4-Inch Brass Female Industrial Coupler, 10-Pack NPT Female Quick Connector Air Coupler with Storage Case

Product ID: 754700979

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Details

Size
1/4'' Female
Material
Brass
Brand
SUNGATOR
Colour
Brass
Connector type
Coupling
Thread size
1/4 inch

📦Organized storage case included

⚙️6 ball bearings for smooth connection

🛠️Solid brass for corrosion resistance

Description

🔧 Connect with Confidence — The Last Coupler You'll Ever Need!

BUILT TO LAST - Solid brass construction ensures unmatched corrosion resistance and durability for heavy-duty use.
ALL IN ONE KIT - 10-pack couplers neatly stored in a rugged plastic case—never lose a fitting on the job again.
PRESSURE READY - Handles up to 300 PSI, perfect for demanding industrial and home applications.
EFFORTLESS GRIP - Knurled sleeve design offers superior grip and sleeve guard prevents accidental disconnects—work smarter, not harder.
UNIVERSAL COMPATIBILITY - 1/4 inch NPT female thread fits most industrial M/D type air plugs for seamless integration.

The SUNGATOR 10-pack 1/4-inch brass female industrial couplers combine solid brass durability with a knurled sleeve for enhanced grip and safety. Designed for industrial M/D type air plugs, these couplers support up to 300 PSI and come organized in a sturdy storage case, making them ideal for professionals who demand reliability and convenience on every job.

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¥22375

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SUNGATOR 1/4-Inch Brass Female Industrial Coupler, 10-Pack NPT Female Quick Connector Air Coupler with Storage Case

Details

Description

Specifications

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Common Questions

Manufacturer	SUNGATOR
Package Dimensions	13.61 x 9.91 x 4.5 cm; 803 g
Size	1/4'' Female
Colour	Brass
Style	10 Pack
Material	Brass
Number of Pieces	10
Measurement System	Inch
Batteries Required?	No
Item Weight	803 g