Interstate Pneumatics 1/4" Poly Bowl in-line filter. General purpose filter protects tools and equipment by removing most solid and liquid contaminants. This may include dust, dirt, pipe scale, rust, liquid water and bulk oil. A 25-micron filter element removes the smallest of particles. See-through bowl allows easy monitoring of fluid level. Quick-release push pin drain for easier use. Help prevents costly damage to air tools caused by rust, scale and moisture. Efficiently traps moisture while passing through clean, dry compressed air. Convenient minimum installation time into your compressed air system.