Brake Proportioning Valve 260-8419 Adjustable Bias Front To Rear Auto Part The generation of adjustable proportioning valves combines the latest refinements to deliver precise pressure metering and strength from a compact forged billet design. Pressure adjustments from 100-1000 PSI and provide for a maximum decrease of 57% in line pressure, the most of any available valve. Adjuster knob with fine thread tuning provides precise pressure adjustment. Its aluminum alloy construction grants it remarkable strength, chemical resilience, and protection against rust regardless of the weather., Manufacturer: KNZVUUY