●Steering Solution: The Mustang II Power Steering Flow Valve for GM Pump solves oversensitive steering problems common with the use of an early GM power steering pump with a Mustang II power rack and pinion, providing a smoother, more controlled steering experience. ●Flow Reduction: The valve effectively reduces fluid flow from 3 GPM (gallons per minute) to 2 GPM, effectively addressing the issue of twitchy or darting steering. ●Compatibility: It is designed for applications using the O-ring style power steering hoses. This valve works optimally with GM "type 1" power steering pumps, providing an easy and effective solution to improve your vehicles steering. ●Detailed Instructions: The product includes detailed instructions for installation, ensuring a hassle-free and smooth process. Its designed to install on the back side of the pump. ●Converting Feature: If youre converting the pump from modern 16mm O-ring to traditional 5/8" inverted flare style hoses and using this pressure reducer adapter fitting, use it in conjunction with Adapter Insert 910-32921 for the best results.