Outerwears Scrub Bag, 14X6 Air Filter, Black 30-1161-01 Outerwears Scrub Bags are strong water-repellent, dirt resisting covers for air cleaners and valve cover breathers. Scrub Bags are used to protect filters and breathers from the outside elements whether your hauling on an open trailer or washing you're vehicle after a long night of racing. Keep things clean and dry with Outerwears Scrub Bags.