2) 12538108660 Replacement Primer Bulbs for Echo Blower String Trimmer - Walmart.com
530047721 Primer Bulb Replacement for Echo SRM-410U (S05403001001 - S05403999999) Straight Shaft Trimmer - Compatible with 12318139130 300780002 188-512-1 Purge Bulb - Walmart.com
Amazon.com: Podoy SRM210 Air Filter RePower Kit with Spark Plug Primer Bulb Fuel Line Hose for Compatible with Echo GT200 PE200 HC150 String Trimmer : Patio, Lawn & Garden