The Tecumseh 33506 Lawn Mower Exhaust Valve Standard helps maintain proper engine performance by ensuring efficient exhaust gas flow during combustion. Designed as a replacement engine component, it opens and closes at the correct intervals to release exhaust gases from the combustion chamber while maintaining proper engine compression. This supports smooth engine operation, reliable ... https://www.wholetoolbox.com/tecumseh-33506-lawn-mower-exhaust-valve-standard/33506.html