1.) For a fast checking leaks in the radiator
2.) Different sizes of pressure test caps and rubber rings
can fit numerous types of vehicles
3.) When operating, connect the pressure tester's quick
coupler to a test cap 0r an adapter with a rubber ring
on the radiator filler neck. Pump the pressure to the
range between 10 and 15 psi to see if there are any
leaks in the radiator
4.) If the gauge pointer stays at the same position for about one
minute, if it is an indication of no leaks in the radiator