this coupling looks very similar to my other quick disconnect coupling but wont fit? Also then the tread size if different so I cant screw on a new

Re: the coupling you need. Since I also was not able to connect my air compressor hose to the air gun, I wrote the company and they gave me this link which I am now ordering. Obviously I haven't tried the gun yet. https://business.amazon.com/abredir/Milton-S-715-M-Style-KWIK-CHANGE-Coupler/dp/B0002SQTAK/ref=sr_1_2?dchild=1&keywords=M+female+coupler&qid=1624841703&sr=8-2 Whether this is absolutely the right coupling for your situation, I cannot say. You could write the company too to be sure.

Will this work with cleaning the dust out of my pc? Does it come with everything I need?

If you have a source of clean filtered dry air then you would need something to connect the air blow gun to the source; ie and air hose. I personally would not recommend using a standard air compressor as you may well blow water, oil or particulate matter into the PC. That's why those cans of compressed air are so handy; no water, no oil, no dust.

How do i connect this to a tire inflator like https://smile.amazon.com/gp/product/b01j8y91gc/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=utf8&psc=1 ?

I don't think you can. The air blow gun has a 1/4 in NPT fitting. It doesn't look like the compressor hose will connect without some kind of adapter. Also whatever you attach to the hose has to activate the valve check to allow passage of air.

Material	Zinc Alloy, Brass, Steel
Brand	JASTIND
Exterior Finish	Chromed Zinc Alloy
Inlet Connection Size	0.25 Inches
Inlet Connection Type	Threaded
Outlet Connection Type	Quick Connect
Maximum Operating Pressure	1.5E+2 Pound per Square Inch
Number of Ports	1
Outlet Connection Size	0.25 Inches
Manufacturer	JASTIND
UPC	682698799826
Part Number	JTABG103B
Item Weight	10.8 ounces
Package Dimensions	5.98 x 4.92 x 1.1 inches
Item model number	JTABG103B
Size	W-4.5" L-5.5" H-0.875"
Color	Black
Batteries Included?	No
Batteries Required?	No

Industrial Air Blow Gun with Brass Adjustable Nozzle, Pneumatic Air Blower Gun with 2 pcs Steel Extensions and Universal Flow Hose, Air Compressor Accessory Tool Dedusting Air Gun

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