Description No More Burning Fingers and Hands! Just Listen for the Whistle to Find the TDC Compression Stroke. The Whistle Alert (Rigid) screws into a spark plug hole to quickly indicate compression stroke. Feature and Benefits: Eliminates the need for an extra hand After installation, your hands are free to complete the job Excellent for use on deep, recessed spark plug threads Flexible model also available (#7894) WARNING: This product can expose you to chemicals including Nickel and Nickel Compounds, which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
