This four way circuit part with OEM numbers 9347022500 and 9347022600 is an essential part of the truck air brake system. It reasonably distributes air circuit pressure to maintain stable and reliable braking response during driving. Adopting high-strength alloy and precision processing, it features excellent air tightness, pressure resistance and corrosion resistance. Made strictly in accordance with OEM standards, it is easy to install and perfectly replaces old or damaged brake circuit components.