NIMTEK New Echo Trimmer Carburetor A021000742 Zama RB-K75 SRM-210 HC-180 High Quality Aftermarket Replacement Part Replaces Part Numbers Echo A02100740 Zama carburetor replaces ECHO A02100740 FITS MODEL SRM 230 STRING TRIMMERs Replaces ZAMA RB-K75 ECHO A02100740 FITS MODEL SRM 230 STRING TRIMMER Match original equipment exactly for a perfect fit, easy to install.