The RYOBI 40-Volt Expand-It Power Head comes with … Homelite st155 powerhead piston and cylinder trimmer part only. C … Stihl FS85R Commercial Trimmer Power Head Only FS 85R. I've found that the Toro's last much longer than other brands I've tried. $309.99 . C $67.90; Buy It Now +C $16.54 shipping; Only 1 left! 100% Buy This. This works very well, i have 0 problems with it. 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2020 string trimmer power head only