Walbro 188-509 primer bulb assembly
Replaces Red Max 12708261 and 516270901, and Tanaka 442-25016-801
Used on Tanaka ECS-290 chainsaws, and TBL500 blowers and Red Max HB260
Walbro carburetor models: HDA-51, WA-180, WA-181, WA-185, WA-187, WA-194, WT-50, WT-138, WT-145, WT-184, and WT-243