Haven't seen this mentioned before...Motorcraft is posting some info on their website.
FL-400S:
Part Number FL400S
Diameter in Inches 2.98
Length in Inches 4.72
Thread Size 3/4 - 16
ADB Valve Material Silicone
RVOP Setting PSI 12.5-18.5
Efficiency @ 20 Microns % 80%
Capacity gr 7
Burst...