Husqvarna 539102606 Filter.eleme Genuine Original Equipment Manufacturer (OEM) Part This part is compatible with models including; ZTHQL4221A (968999172),968999172,968999170,ZTHKH4820A (968999158),ZTHQL4218A (968999170),968999158,968999169,ZTHKH4818A (968999157),968999157,968999168,ZTHKW4818A (968999168),ZTHKW4821A (968999169) Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Husqvarna Perfect for replacements or repairs!