S & G Tool Aid 98700 Large Oiler with 3/8" NPT - Automatically lubricates air tools as they are being used. Ends tool burn out, stops rust and increases torque. Lubricates all internal moving parts. Large capacity reservoir. Designed for use with 3/4" and 1" drive pneumatic tools. High impact clear plastic reservoir allows technician to monitor oil supply. 3/8" NPT Female inlet x 3/8" NPT Male outlet.