SAE J2044 clarification

[Andy330hp]

I need help understanding some information in this fuel fitting specification.

In figure 2, they sometimes list two possible dimensions. One is for those that are "PA coated". The other option does not have a note. What is "PA coated"?

 

[Pillan]

Andy,
Check out

http://www.sanoh.com/flash/english/products/tube_03.htm.

PA coated: Polyamide coated?
Good luck.