Donaldson Powercore(R) Ultra Web air filters, filter more and protect better for longer than traditional cotton gauze style filters, protecting your engine from damaging particulates. Donaldsons PowerCore Filtration with Ultra Web technology is 99.96% efficient providing greater protection to your engine. Donadlson PowerCore Ultra-Web Filters are ideal for sever duty vehicles, vehicles operating in dry, dusty airrid environments or anyone looking to maximize the protection of their engine. Donaldson Powercore air filters are warranted for 4 years or up to 150,000 miles.