Fit for: ( Replace Part#:  Walbro WA55 WA55A/B WA551 )
PB-400 (001001-054522) Backpack Blower
PB-400 (054523) Backpack Blower
PB-400E (001001-128095) Backpack Blower
PB-400E (128096-249241) Backpack Blower
PB-400E -249242 Backpack Blower
LBB-4000 (After S/N 001001)