RPM Hydrophobic Water Repellent Pre Filter
RPM’s proprietary silicone treated Micron Screen material is built specifically for dry flow air filters to enhance efficiency and prolong performance. This Hydrophobic water-repellent treatment blocks small dirt & dust particles down to .005” while adding little to no air restrictions. 
RPM Pre-Filters are manufactured from a durable Micro Screen material
Hydrophobic material with uniform micron sized openings that allow air in, yet filters out the unwanted elements, such as sand, dirt, clay and even water.
Filters debris as small as .005 in diameter without air flow restriction
Silicone impregnated micro-mesh creates a water repellant barrier
Pre Filter ONLY, No Air Filter Included