Interstate Pneumatics W1090A is a 1” heavy duty large metal bowl filter that helps prevent costly damage to air tools caused by rust, moisture and scale. This is a general purpose filter that protects tools and equipment by removing most solid and liquid contaminants that include dust, dirt, bulk oil and water. A 40-micron filter element inside the housing removes the smallest of particles. Features a quick release bowl and quarter turn drain for easier use, a see-through bowl with a metal guard that allows easy monitoring of fluid level while protecting the unit against impact. Overall, this unit effectively traps moisture while passing through clean, dry compressed air.