HIPA RB-23 Repair Kit Gasket Diahpragm Primer Bulb for ZAMA RB-K17 C1U-K27 A-D Carb ECHO Little Wonder Mantis Trimmer Replacement manufacturer part number: RB-23 Compatible with ZAMA C1U-K17 C1U-K27A C1U-K27B C1U-K27B C1U-K27C C1U-K27D carburetor Primer bulb included