Milton 1037 1/2" NPT Metal FRL Coalescing Filter 1/2" national pipe thread Maximum pressure of 250 pounds per square inch Maximum of 37 standard cubic feet per minute at 100 pounds per square inch Operating temperature range of 40 degrees Fahrenheit to 160 degrees Fahrenheit .03 sub micron = 99.97 efficiency All Milton FRL components are 100% tested before leaving the factory