1/4 Female National Pipe Thread + 1/4 Male National Pipe Thread Air Line LubricatorThe 1 4 Female National Pipe Thread + 1 4 Male National Pipe Thread Air Line Lubricator is a high quality and cost effective air tool accessory designed to add oil to the compressed air supply. This lubricator helps keep pneumatic tools and machinery operating smoothly by providing continuous lubrication to the moving parts of your equipment. Metered lubricant boosts tool performance and lifespan, especially when placed in line at the tool to conserve