HIPA RB-98 Carburetor Repair Kits for Troy-Bilt TB70SS Trimmer Replacement manufacturer part number: RB-98 Fits ZAMA C1U-P17 C1U-P21 C1U-P21A C1U-P21B C1U-P23 carburetor The TB70SS Came with 3 different carburetors....Zama, Nikki Make sure which carburetor you have before ordering....This kit covers the Zama carburetors