3Pack 530047721 Primer Bulb Replacement for Echo PB760LNH Backpack Blower Overview This 3pack of primer bulbs is a direct replacement designed for Echo PB760LNH backpack blowers with serial range P37812001001 P37812999999. It is also compatible with purge bulb part numbers 12318139130, 300780002, and 1885121. Each bulb restores the priming function that helps the engine start reliably. Key benefits Reliable starting: Restores the primer function that draws fuel into the carburetor for quicker, more consistent starts. Direct fit compatibility: Made to match the listed part numbers and the PB760LNH serial range for a correct fit without modification. Comes as a 3pack: Keeps two spares on hand to reduce downtime and simplify maintenance scheduling. Simple installation: Designed for quick, tool replacement to get equipment back into service fast. Durable construction: Engineered to withstand repeated use and exposure common to outdoor power equipment priming systems. Important attributes Function: Primer bulb for purging air and priming the carburetor prior to engine start. Compatibility: Echo PB760LNH backpack blower serial range P37812001001 P37812999999; compatible with part numbers 12318139130, 300780002, 1885121, and 530047721. Quantity: Pack of three identical primer bulbs. Fit: OEMstyle fit intended to the original purge bulb used on the specified blower models. Performance: Provides consistent suction and sealing to reduce misfires and extended pull starts when correctly installed. Typical use scenarios Routine maintenance: a cracked or hardened primer bulb during seasonal tuneups to maintain starting reliability. Field spare kit: Carry the extra bulbs on the job for quick onsite replacement and minimal equipment downtime. Poststorage service: Install primer bulbs after winter storage to clear air from fuel lines and make cold starts easier. Notes Confirm compatibility with your blower serial number before . If uncertain about installation, consult a service manual or a qualified technician for guidance.