Proform Dual Gauge Leak Down Tester 66839

A leak down test is one of the most critical diagnostics you can perform on an engine—it reveals precisely where compression is being lost before catastrophic failure occurs. The Proform 66839 dual gauge system gives you professional-grade accuracy to identify leaking valves, worn rings, or gasket failures, helping you make informed rebuild decisions and avoid costly guesswork. Whether you're diagnosing a performance drop or validating machine work, this mechanical tester delivers repeatability and reliability in the shop.

• Dual analog gauges
• Mechanical operation
• Complete kit included
• Industry-standard design
• MPN: 66839