This Stens 105-501 muffler is the perfect replacement for your Briggs & Stratton lawn mower. It is compatible with model number 394569S and comes sealed in its original packaging. Made in Taiwan, this muffler is a high-quality replacement part for your lawn mower, ensuring that it will run smoothly and efficiently. With one muffler in the pack, this is the ideal solution for those looking to replace their worn-out or damaged muffler. The Stens brand is known for its high-quality lawn mower parts, and this muffler is no exception. It is easy to install and will provide your lawn mower with the necessary noise reduction to ensure that it runs smoothly.