Carburetor Kit / Zama RB 21Pack Size:1Echo 12530042030, Zama RB-21J. Thomas RB-21, Laser 48073, Laser 40754, NHC 203-5850, Oregon 49-822, Oregon 49-865, Oregon 49-822-0, Prime Line 7-07198, Rotary 9297, Sunbelt RB-21, Sunbelt B1RB21, Tilton ZRB21Echo SRM1500, SRM2300, HC1000, SHR-040, SV4,HC1500, PB1000, GT2103 and GT1100 trimmers; Zama C1U-K4; C1U-K7, A; C1U-K8, A; C1U-K9, A; C1U-K10; C1U-K11; C1U-K14; C1U-K15, A-B; C1U-K16,A; C1U-K26; C1U-K29 and C1U-K32, A carburetors Not compatible with greater than 10% ethanol fuel