*This part replaces obsolete part #: and 78890-18000.
does this part replace the speed-feed 375 with P/N 78890-28000 that is on my E4-B3000 Brushcutter from Swisher?
does the speed feed 375 fit the redmax tr2350s trimmer?
In answer to your question, the Shindaiwa Speed Feed will fit your Redmax TR230S Trimmer. They come with several adapters to fit the size of the spindle on your trimmer.
Hope this helps,