CATEGORIES HOMEKarting AccessoriesFilters and Pre-Filters Outerwear Prefilter 3.5" x 4", Blue Item Number: 115-4TBL Price: $15.40 Add to Cart Description Outerwear Prefilters are the most trusted name in the prefilter business. They increase the life of your engine by keeping out even the smallest dirt particles. Accessories Klotz Fabric Filter Spray Outerwear Prefilter 3.5" x 4", Red Outerwear Prefilter 3.5" x 4", Black