Ideal for high filtration of oil aerosols and sub micron particles down to.03 microns. Air flows from the inside to the outside of the coalescing media. These are a must in any painting or sophisticated air system. Built with 6oz reservoir, sight glass, internal auto float drain and pop-up indicator alerts of abnormal condition such as excessive flow. Used in 20474 system. Max 175 psi, Max flow 37 cfm. Replacement element 20597. 1/2" NPT. MADE IN USA