Specifications Hign-concerned Chemical:None OEM NO.:A021001590 A021001591 A021001592 A021001593 Product Description: High quality and durable Good working conditions and easy installation Sufficient warranty time and good after-sales service Please rest assured to buy products from our shop Product Application: A021001590 A021001591 A021001592 A021001593 Fits Echo Models Below w/ RB-K90 Carb: PB-251 S/N: P06113001001 - P06113999999-->Carburetor -- RB-K90 S/N: P06113002451 - P06113999999 PB-251 S/N: P07611001001 - P07611999999-->Carburetor -- RB-K90 S/N: P07611022475 - P07611999999 PB-251 S/N: P09012001001 - P09012999999-->Carburetor -- RB-K90 S/N: P09012139270 - P09012999999 PB-255LN S/N: P35012001001 - P35012999999-->Carburetor -- RB-K90 PB-255LN S/N: P35111001001 - P35111999999-->Carburetor -- RB-K90 PB-255LN S/N: P35213001001 - P35213999999-->Carburetor -- RB-K90 PB-255 S/N: P06213001001 - P06213999999-->Carburetor -- RB-K90 PB-255 S/N: P07711001001 - P07711999999-->Carburetor -- RB-K90 PB-255 S/N: P09112001001 - P09112999999-->Carburetor -- RB-K90 ES-255 S/N: P00811001001 - P00811999999-->Carburetor -- RB-K90 ES-255 S/N: P07213001001 - P07213999999-->Carburetor -- RB-K90 ES-255 S/N: P18812001001 - P18812999999-->Carburetor -- RB-K90 Notice/Product Specifications: Pls check your old picture or model when you order it If you are uncertain about the item Please feel free to contact us for confirmation Sorry for any inconvenience caused Full refund guarantee if does not fit The Package Includes: 1 carburetor + 2 primer bulb + 1 air filter + 2 pcs gasket + 1 fuel line kit + 1 spark plug + 1 grommet. As Picture Show