A pressure decay testing system including a testing device for determining the reliability of connectors is provided and includes a pneumatic cylinder that raises and lowers a sealing member that closes a second end of a connector inserted in the device. A base member is adjacent pneumatic cylinder and includes a receiving surface having at least one receiving member for holding the connector. A channel is disposed therethrough though the receiving surface of the base member and aligns with an inner bore of the connector inserted in the testing device. An air line is attached to base member fluidly connecting inner bore of the connector with decay tester. Decay tester introduces a pressure differential through the channel to reach a predetermined set point pressure when the connector is closed by the testing device. Decay tester is configured to measure a change in pressure over time with respect to the predetermined set point.