FitBest New Zama Carburetor RB-K106 RBK106 For Echo PB-250 PB-250LN ES-250 A021003660 Power Blowers 100% Brand new aftermarket carburetor Replaces Zama RB-K106 Fits Echo part number: A021003660 Compatible with Echo PB-250 PB-250LN ES-250 String Trimmers