It looks like Rhom Airs. Not a 100% sure but looks like maybe air supply from valve to one of the center tubes, to tank on other center tube( across from each other). Both up lines to rear faceing & rear vertical tubes, and down lines to same in front.( or vice-versa)just up at one end & down at other. If you are not completely confused, then I can't help anymore

Good Luck
Terry