Honda SSBL VersAttach System 196 MPH 250 CFM Blower Attachment Pairs with both the UMC425 and UMC435 Honda versattach power heads Maximum airspeed with the UMC425 power head is 184 MPH and with the UMC435 is 196 MPH Every versattach attachment comes with a handy hook for easy storage, the cap also prevents dirt and dust from building up in the spline Maximum air volume with the UMC425 power head is 235 CFM and with the UMC435 is 250 CFM Blower attachment is part of Honda's exclusive versattach system, it is interchangeable with any of 5 other options: trimmer, edger, hedge trimmer, pruner, and cultivator