ECHO PB-7910T Leaf Blower Backpack Tube Mount Throttle 79.9cc EngineECHO PB 7910T Leaf Blower Backpack Tube Mount Throttle 79. 9cc Engine The ECHO X Series PB 7910T expands ECHO's lineup of commercial grade high performance backpack blowers by providing higher power at a lower price point than competitive models. It features an advanced 79. 9cc 2 stroke engine making it the most powerful blower on the market under $600 MSRP. Features: 79. 9 cc professional grade, 2 stroke engine 40N of blowing force Padded shoulder