The Rigid Whistle Alert screws into a spark plug hole to quickly indicate compression stroke.
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
Made in the USA; Lifetime Warranty
Also available: #7894 Whistel Alert (Flexible)
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov