Regulator has a -6 AN provision to hook the incoming fuel line to with two -6 AN fittings to connect to the two carburetors, then on the other end there is a -6 brass check valve that once fuel pressure builds it will kick the check open and bleed off any excess fuel that is not being used back to the fuel tank.
The alum. block is polished to a show shine and can be used with #2200-0012P fuel line kit. Includes detailed plumbing instructions.