Compression Test Kit — 8-Piece Petcock Gauge

Diagnose worn rings, leaking valves, and head gasket failures with this engine compression test kit. The petcock release valve holds readings until you reset, and the adapter set covers most domestic and import spark plug thread sizes from 10mm to 18mm.

• Petcock hold valve — reads stay until reset
• 0-300 PSI gauge
• Adapters for 10mm, 12mm, 14mm, and 18mm plug threads
• 3-foot pressure hose
• Blow-mold case included