Proform 66839 Dual Gauge Leakdown Leak Down Tester with 14 mm spark plug adapter

Proform Dual-Gauge Leakdown Tester 

Part#66839

This dual-gauge leakdown tester measures the condition of your head gaskets, piston rings, and valves. The gauge records incoming air pressure, and the right gauge records individual cylinder pressure - and the difference is you leakdown. Includes 14mm spark plug adapter