FitBest Carburetor Replaces Zama RB-K70A RB-K70 RB-K66A RB-K66B and Echo A021000380, A021000720, A021000721 New quality aftermarket carburetor Replaces zama carburetors RB-K70, RB-K70A,RB-K66A, RB-K66B Replaces ECHO A021000380, A021000381, A021000382, A021000720, A021000721 A021000722 100% Brand new and high quality