The Ridgid 58002 Needle Valve helps control fluid flow for accurate pressure testing and dependable pump operation. This valve regulates the passage of testing fluid within the pressure test pump, allowing flow to be adjusted as needed during filling and pressurization. The assembly includes the needle valve knob for convenient adjustment. Replacing a worn or damaged valve can help re... https://www.wholetoolbox.com/ridgid-58002-needle-valve/58002.html