Magnafuel MP-9433-BLK Fuel Pressure Regulator 4-12PSI 10AN Inlet 4 6AN Outlets Black. They feature a durable metal-to-metal seat for instantaneous response and low maintenance. Two and four-port configurations are available. The boost-reference models provide a 1:1 compensation ratio. They’re suitable for drag racing, Circle Track, road racing, mud bog, power boat, and tractor pulling. These regulators offer adjustable base pressure and precise pressure control. MagnaFuel carbureted fuel pressure regulators are machined from billet aircraft aluminum and are anodized for a long-lasting finish.