Dave it is Autobest F4027. The output pressure on mine is 2.5 to 3.2 psi. You can see it on Amazon (for one source). Autobest from what I've read began in China around 1994 and since 2007 has been in the USA.

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end