The garage standard is PCL fittings sold at machine mart.
The thread to the air gun is 1/4 bsp.
Your fittings don't look like PCL on the air line it's difficult with your photo, But pop down to a tool company or online and change over to PCL and you can get these all over the uk.
The compressor ideally wants to be 100ltrs tank minimum to work a air gun but will work on a 25ltr to undo a stuck bolt but will rapidly deflate the tank supply.
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