Primer Bulb Replacement 4 Pack for Echo PB770H, Easy Engine Start, Direct Fit for Backpack Blower

4Pack 530047721 Primer Bulb Replacement for Echo PB770H (P30613001001 P30613999999) Backpack Blower Compatible with 12318139130, 300780002, 1885121 purge bulb Product overview This 4pack of primer bulbs is a direct replacement designed for the Echo PB770H backpack blower models in the serial range P30613001001 to P30613999999. Each bulb restores the fuel priming function so the engine receives the correct fuel mixture for easier starting and consistent operation. Key benefits Restores reliable priming and easier starting: Replaces worn or cracked bulbs so the carburetor receives proper fuel pulses during startup. Four bulbs per pack: Keep spares on hand for seasonal maintenance or quick field repairs without interrupting work. Direct fit for specified models and part numbers: Designed to match the original fit and function for Echo PB770H (P30613001001 P30613999999) and compatible with part numbers 12318139130, 300780002, 1885121 purge bulb. Durable and flexible construction: Built to handle repeated use and typical outdoor operating conditions while maintaining airtight seals for dependable priming. Simple replacement: Intended to install into the existing primer bulb housing, allowing straightforward maintenance without complex tools. Important attributes Function: Primer bulb for fuel priming prior to engine start. Compatibility: Fits Echo PB770H backpack blower with serial numbers P30613001001 through P30613999999; replaces purge bulb part numbers 12318139130, 300780002, 1885121. Quantity: Pack of 4 replacement bulbs. Fit and performance: Engineered to match original dimensions and restore priming performance for consistent starts. Practical use scenarios Routine maintenance: old or brittle primer bulbs during annual service to ensure reliable starting at the beginning of the season. Onsite : Keep a bulb from the pack in a service kit to quickly fix a blown or leaking primer bulb during jobs in the yard or on a property. Fleet support: Stock multiple bulbs for crews that maintain several backpack blowers to reduce downtime and simplify parts management. Notes Use this 4pack of primer bulbs as compatible replacements for the listed Echo PB770H serial range and the specified purge bulb part numbers. Inspect the primer bulb housing and fuel lines during replacement and follow safe engine maintenance practices.