HIPA A021001591 Carburetor with Primer Bulb for ECHO ES-255 PB-251 PB-255 PB-255LN Blower Replacement manufacturer part number: RB-K90, A021001590 A021001591 A021001592 A021001593 Fits ECHO ES-255 PB-251 PB-255 PB-255LN blower Package include: 1 carburetor + 2 primer bulb