Replacement Filter Elements for Arrow Pneumatics F55 Series Coalescing Filters. The EK55 and EK55A is designed for high-efficiency filtration, capable of removing oil and particles down to 0.03 and 0.01 microns with an oil removal rating of 0.01 ppm, according to aftermarket specifications from eIndustrialSolutions. This level of filtration ensures that downstream equipment, like air tools or pneumatic systems, is protected from oil contamination, which can cause wear, corrosion, or malfunctions. For instance, in a body shop where compressed air powers paint sprayers, this filter helps prevent oil spots or defects in the finish, ensuring a higher-quality result. The EK55 and EK55A Arrow Pneumatic coalescing filter provides superior oil and particle removal, protects downstream equipment, extends the life of air dryers, and offers durability, compatibility, and cost-effectiveness, making it an excellent replacement filter for maintaining the efficiency and longevity of compressed air systems. Arrow pneumatics full line of filters, regulators and lubricators are proudly made in the USA.