Compression Gauge Extension

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 alloyThis 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.