American Lube F35121-421 1/4" Module/Air 1000 Series Filter with Brass InsertAmerican Lube F35121 421 Aro Flo Compressed Air Filters Are Designed To Remove Airborne Solid And Liquid Contaminants. Filters Can Be Ordered With Different Elements, Including Coalescing Models Which Are Capable Of Removing Oil Aerosols And Particles Down To 0. 3 Micron. Standard Filters Are Sold With 5 Micron Elements; 40 Micron Elements Can Be Purchased And Installed Separately. 1 4" Module Air 1000 Series Filter With Brass Insertcomes With Metal