Compatibility: Compatible with Einhell BG-PT 2538 Compatible with Echo 123.181.40630 Compatible with Fricke 40270092 Compatible with Homelite 01201 Compatible with Mc Culloch 225 834-00 Compatible with Mitsubishi KK 21017 SS013 Compatible with Oregon 49-020 Compatible with Ratioparts 151-136 Compatible with Shindaiwa 20036-81670 Compatible with Stihl 4133.121.2700 Compatible with Walbro Room 188-121 Replace:the bulb with a flange diameter of 16mm, an outer diameter of 20mm, and a height of 14mm Easy to install: These primer bulbs are designed for direct installation and can be easily installed into carburetors without the need for specialized tools, making repairs quick and easy. Performance Enhancement: By ensuring proper sealing and efficient fuel delivery, this primer bulb helps achieve smooth engine start-up and reliable operation, which is crucial for maintaining the performance of the trimmer. Packaging: Includes 5 primer bulbs., Manufacturer: YINETTECH