According to my experience, this Fuel Cap is a great replacement to keep your Stihl chainsaw running .It fits perfectly and is easy to install making it a hassle-free experience. The quality of the material used is top-notch and has a sturdy built. It keeps the fuel secure and prevents leaking. The only downside is that the price could be a bit lower, but it's worth the investment. Overall, highly recommended for industrial and scientific use..