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Global West sells knob style adjustable proportioning valves from Wilwood.The new generation of adjustable proportioning valves from Wilwood combines the latest refinements manufacturing processes and materials to deliver precise pressure metering and unyielding strength from a compact and lightweight forged billet design.Available in two styles, with knob or lever precision proportioning ( part #W260-8420) from 100 to 1,000 PSI, at full release, valves are capable of up to 57 percent reduction in line pressure. The new smaller body accommodates easy mounting in a variety of locations in conjunction with two .25 diameter holes on 1.00 centers. Along with standard 1/8 NPT inlet and outlet ports and two 1/8 NPT to 3/8-24 I.F. brake line adapters (included with each valve) makes installation simple.Wilwood Knob Style Adjustable Proportioning Valve for A-Body ClassicsQuality and performance come together with theWilwood Knob Style Adjustable Proportioning Valve, perfect for enhancing the braking system of your classic A-Body vehicles, including the1964-1972 GTO, LeMans, Tempest, and T37. Our commitment to excellence means you can trust this valve to deliver precise pressure metering while maintaining unyielding strength. We understand that tackling brake upgrades can be daunting, which is why we provide comprehensive instruction sheets and video tutorials to guide you through the installation process. Plus, our dedicated customer support team is always available to assist you with any questions or concerns. Explore more options in ourWilwood Brake Componentscategory, or check out ourChevrolet Brake Componentsand1958-64 Chevrolet Brake Componentsfor additional upgrades tailored to your classic ride.