OEM Carburetor Kit / Zama RB-71Pack Size:1Zama RB-71NHC 203-5533, Rotary 13638Echo TC2100, SV-4/E,B and SRM-251S trimmers; Zama C1U-K54, A; C1U-K81 and C1U-K82 carburetors Not compatible with greater than 10% ethanol fuel