FitBest Carburetor Carb Replaces Walbro WYK-345 / WYK-406 Echo A021001870 PB-770 H T Backpack Blower 100% Brand New and High Quality Carburetor For Echo PB-770 PB-770H PB-770T Blower Replaces Echo Part #: A021001870 A021003940 Replace Walbro Carburetor #: WYK-345, WYK-406