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Q:Will this product be compatible with my greenworks 21272 string trimmer? and if not, what spool is available for replacement for this model?
A:No,the item is not compatible with the 21272 trimmer.
Q:How do you load the Greenworks replacement line (for string trimmer) model 21602 (20V lithium trimmer)?
A:Replacement instructions can be found on page 11 of the manual. Here is a link to the manual: