Replaces OEM: Echo: 12530008360, Zama: RB-44. FITS MODELS: Echo PB4600 and PB6000 blowers, Zama C1M-K24, A-B; C1M-K25, A-B; C1M-K49, A-C; C1M-K76 carburetors. SPECS: Ethanol: Not compatible with greater than 10% ethanol fuel. ADDITIONAL INFO: CrossSell: 615-526 Use with 615-449 OEM Carburetor, Substitute: 615-526 Interchangeable with 615-253 OEM Carburetor Kit.