Echo Original Equipment TUBE, BLOWER - SWIVEL - 21200503460 · LBB-4000-->Fan Hsng,Handles,Engine Cov,Throttle,Stop Sw,Bkpack Fr,Harn,Blow Pipes · PB-300E S/N: 0000000 - 0049617-->Backpack Frame, Blower Tubes, Strap, Tools · PB-300E S/N: 0049616 - 9999999-->Backpack Frame, Blower Tubes, Strap, Tools · PB-400E S/N: 128096 - 249241-->Fancase, Backpack Band, Frame, Thrtle Ctrl, Switch, Blowing Pipe, Tools · PB-400E S/N: 249242 - 999999-->Backpack Frame, Blower Tubes, Strap, Tools · PB-400E Type 1E-->Frame, Back Pack, Pipes · PB-400E Type 1E-->Blower Tubes, Frame, Strap, Tools · PB-400E Type 2E S/N: 509501 - 999999-->Harness, Blower Pipe · PB-410 S/N: 03001001 - 03999999-->Blower Tubes · PB-410 S/N: 09001001 - 09999999-->Blower Tubes · PB-410 S/N: P07911001001 - P07911999999-->Blower Tubes · PB-410 S/N: P09412001001 - P09412999999-->Blower Tubes · PB-411 S/N: 02001001 - 02999999-->Blower Tubes · PB-411 S/N: 09001001 - 09999999-->Blower Tubes This is an OEM Echo part.