Never seen one of those Fred. The numbers are in millimeters so a 1.3 is one tenth of a mm smaller than a 1.4. It should work just fine. HVLP need high volume. DUH. lol. A lot of people do not address this. I use hi-flow fittings and and regulate at the wall. No regulating at the gun. Run the gun air regulator wide open if it has one. Looks like a good gun.