The Cup Type Test Tool is designed for locating casing leaks, with the ability for downward movement under pressure for determining exact point of leak off. It is typically made up with a bypass valve above it, and lowered into the wellbore. The test tool is run to depth with the bypass valve closed. With the pack-off head or the pipe rams closed at surface, pressure is applied on the annulus and charted to determine whether there is a leak off. If a pack-off head is used, connections may be made up and the work string lowered into the well until a bleed off point is found. Once the leak point has been determined, the test tool is retrieved by; bleeding off the annulus pressure, opening the bypass valve, and pulling the assembly from the wellbore.