Tru-Flate 41-101 in-Line Tool Oiler Compact oiler that fastens directly to the air tool Precisely meters proper amount of oil to the tool only when the tool is in use Use on all air impact guns, air wrenches, body shop air tools and pneumatic hammers requiring 1/4 inch air lines Never use motor oil in pneumatic tool Prevents burn out of expensive pneumatic tools stops; rust and increases torque up to 25 percent