Husqvarna Fuel Filter Part # 503517101 Genuine Husqvarna Part # 503517101 Fits Specific Husqvarna Models That Require This Part # Also Will Fit Other Husqvarna Produced Brands that Require This Part Number (AYP, Craftsman, Jonsered, McCulloch, Poulan, Poulan Pro, RedMax, Sears, Weed Eater) Please Make Sure to Order For Your Model/Spec/Serial Not By Looks or Guessing Genuine OEM Husqvarna Part