Ideal for high filtration of oil aerosols and sub micron particles down to 0.03 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, drain valve and a pop-up indicator alerts of abnormal condition such as excessive flow. Max 250 psi, Max flow 37 cfm.1/2" NPT. MADE IN USA Replacement element 20597