Echo Carburetor Repair Kit for Zama C1U-K Series RB-21 Diaphragm SetEcho Carburetor Repair Kit for Zama C1U K Series RB 21 Diaphragm Set Made to OEM Specs to Provide a Direct Fitment & Easy Install! Manufactured with High Grade Materials by an Industry Leader Expedited International Shipping to the U. S. OEM Cross References: RB 21 Fits Models: Echo AT 200G Echo GT 2100 Echo HC 1600 Echo PB 1000 Echo PB 1010 Echo SHR 040 Echo SRM 1500 Echo GT 2000 Echo SRM 2110 Echo SRM 2300 Echo SRS 2100 Echo TT21A Specifications: RB