This part is commonly Used on models:
30941 41cc Back Pack Blower
51641 TC 1000 Gas Trimmer
51642 TC 2000 Gas Trimmer
51643 TC 3000 Gas Trimmer
51644 TC 4000 Gas Trimmer
51645 TC 5000 Gas Trimmer
51650 TC 3100 Gas Trimmer
51660 TC 3500 Gas Trimmer
51644V TC 4000 Gas Trimmer
51645V TC 5000 Gas Trimmer
