The new generation of adjustable proportioning valves combines the latest refinements in manufacturing processes and materials to deliver precise pressure metering and unyielding strength from a compact and lightweight forged billet design. Pressure adjustments range from 100-1000 PSI and provide for a maximum decrease of 57% in line pressure, the most of any available valve. This adjustment lets you fine tune the front to rear braking balance by proportionally decreasing the rear (or in some cases the front) brake line pressure. Can also be used to adjust individual front wheel braking in dirt track applications. Valves weigh only 5.2 ounces (knob), 6.1 ounces (lever), and have two .25" side mounting holes spaced 1.00" apart. Standard in and out ports are 1/8-27 NPT.