Fuel return line size.

[CrawlinZX14]

As the title says, im looking for the size of the fuel return line off the OEM FPR on a 1g. I need to order a sleeve and nut to properly attach the AFPR to it, and my micrometer is MIA, so I cant get an accurate measurement without dumping fuel. Can anyone tell me the size? Is it 3/8?

 

[Swarley815]

Im pretty sure its 1/4"

 

[CrawlinZX14]

Thats a -4an line, 3/8 is a -6 line, I just want to verify.