Features and Benefits:

• Works deep-hole pings and hemi engines
• Extends spark plug hole 7.5 inches
• Attach compression gauges easily
• 14mm thread diameter
• Steel 1144 alloy

This extension is 8" in length and brings a spark plug hole above the valve cover on deep plug hole and HEMIspherical engines for easy compression gauge attachment. The O-Ring seal allows complete compression transfer. Comes with a Lifetime Warranty.