Malpassi - fuel pressure regulator

[uglymug]

Hi Guys . The fuel pressure on the car is 20psi so a while back I got a malpassi reg from fleabay. Only thing is it came with no paperwork. So can someone please tell me which holes do what. I take it the small tube at the bottom by the dome nut is the vacuum connection. Not sure which way the petrols flow and return is. One barbed fitting on top, another on the side..........Ta like!