Designed for use with Aeromotive Mechanical Fuel Pumps #027-11105 and #027-11107, the Double Adjustable Carbureted Regulator guarantees precise, accurate, and reliable fuel control unmatched by any other fuel pressure regulator. Set idle pressure separately from high-RPM settings. No jets, pills, or ball valves required. The -10AN O-ring inlet port is perfect for a fuel log; the -10AN return port is sufficient for large mechanical pumps. Type II bright dip anodized finish protects the 6061 T6 aluminum alloy body and cap. 4-port unit also available with three -8AN outlets (#027-13209).