Ideal for carbureted nitrous engines, these Aeromotive regulators can be stacked together to control multiple pressures with a single fuel pump. Capable of feeding single or dual carburetors, they give you total control of unique fuel pressures at every distribution point. These Aeromotive stackable regulators are a clean, lightweight solution, perfect for nitrous engine combinations where unique pressures are desired. The Aeromotive stackable regulators create their own integrated fuel log by utilizing a patent-pending, flow-through designed modular regulator body. Using a positive O-ring seal and the provided cap screws and O-rings, simply bolt as many of these regulators together as needed. Aeromotive manufactures these regulators from billet CNC-machined aluminum and they are adjustable from 5-12 psi.