The Graco 18H056 Quickshot Needle Valve Kit is a replacement valve assembly designed for compatible Graco QuickShot sprayer equipment. It works by controlling the flow of material through the sprayer, helping maintain consistent operation and proper application. Replacing worn or damaged valve components can help restore reliable flow control and support normal equipment performance. https://www.wholetoolbox.com/graco-18h056-quickshot-needle-valve-kit/18H056.html