Note: At times I will need to source other companies to provide these to you. Don't be alarmed if it looks a little different than the QDs that are in the photos and are a different brand.
Stainless steel quick disconnects(QD) are designed for higher pressure than us car guys will be using but will hold up much better to corrosion. Also, it looks much better and really doesn't cost much more.
Inlet = 1/4" (National Pipe Thread) NPT Male: This 1/4" male threaded end screws into a female 1/4" connection.
Outlet = 1/4" (Quick Disconnect) QD Coupler: This 1/4" female QD accepts a 1/4" male plug.