HOOAI New Primer Bulb For Stihl FS46 FS45 FS55 FS40 FS40C FS50 FS90 String Trimmer (5pcs) Fits stihl FS46 FS45 FS55 FS40 FS40C FS50 FS90 Replace ZAMA 0057003 0057004 0058001 3 Months warranty from our store! Please feel free to contact us if you are not sure which part to order! We provide 90 days warranty for all items from us!