Capable of feeding single or dual carburetors and 1, 2, 3 and 4 or more stages of nitrous, all with total control of unique fuel pressures at every distribution point. For the ultimate nitrous fuel system, it?s easy to combine Aeromotive?s Pro-Stock 2 or 4-port regulators with the new Stackable Regulators, where all flow and pressure control is consolidated for a much cleaner, lighter package. Screw the combined Stackable Regulators to the inlet of an Aeromotive Carbureted Fuel Pressure Regulator, either dead-head or bypass style and control your carburetor system pressure separate from each stage of nitrous. With the new Aeromotive Stackable Regulators, you have more flexibility than ever before. These regulators are completely serviceable in the field without removing them from the car and can be combined with the Aeromotive A2000 fuel pump or the A1000, Eliminator and Pro-Series Pump. Adjustable from 5-12 PSI. ORB-10 inlet and outlet flow-through ports (flange stackable). ORB-06 outlet ports. Includes (2) O-rings, (2) 12-point cap screws. Serviceable in the field without removing from the car.