Abstract: A containment and collection system for leakage occurring within a plumbing run is disclosed and comprises a secondary sleeve with couplers fittable onto the piping of a plumbing run. The sleeve and couplers are oriented to form a void between the piping of the plumbing run and the sleeve and the couplers, and where the void allows for the collection and retention of any leakage. The sleeves and couplers extend for the length of a plumbing run and may then be directed to a collection basin where any leakage can be accumulated. The collection basin may include a level sensor and alarm for notification of a leak event. In an alternate embodiment, a sleeve for a containment and collection system includes a longitudinal opening or slot which can be spread to allow installation onto the piping of a plumbing run. The opening also allows visual observation for the detection and location of a leak.