PB Blaster quickly loosens frozen and rusted parts. Using a non-evaporating lubricant that safeguards against future corrosion and rust . It is a terrific rust inhibitor and Penetrating oil for rusted bolts and screws. It also is effective on corroded pipe thread and other agricultural, industrial, and plumbing applications. This product features the Pro Straw with control flow technology. Simply use the volume adjustor to control the flow.