PSFIII is a Huyndai/Kia product and seems to have been discontinued.
This is from a Kia bulletin;
PSF-III is not available through Kia Chemicals: Use a high quality power steering fluid like Valvoline® or equivalent, DO NOT use ATF in place of power steering fluid.
Some models use PSF-4 which is available through PDC.
Always use the correct recommended fluids as required!