HOOAI New Carburetor Carb with Gasket For Echo PB-770 PB-770H PB-770T Backpack Blower Replace A021003941 A021001870 A021003940 Walbro WYK-345 WYK-406 Direct Replacement! Bolt-on & Go parts! 3 Months warranty from our store! We are professional auto parts manufacturer and seller! Please compare your old part with the pictures if you are not sure if it will fit.