Plug hole, and fill the cylinder with compressed air. When replacing the spring, be sure to maintain air pressure in the cylinder. chamber/cylinder to be filled with compressed air, keeping the valves.

Brand: Unbranded
Engine Type: Gasoline
Features: Multiple Measure Scales
Maximum PSI: 300 PSI
Type: Compression Tester
Unit Quantity: 5
Vehicle Type: Heavy Duty/Commercial, Motorcycle, Passenger Vehicle
Warranty: 1 Year