Regional Asset Operations Manager with Irish Water told Morning Ireland that a fitting on top of the pipe, that was laid 40 years ago, was “sheared off”.
Uisce Éireann is working to restore water supply as "quickly as possible" to impacted customers in parts of the city centre and surrounding suburbs following a burst to a high-pressure water main.
Residents across the capital are being urged to support elderly and vulnerable neighbours as a major water outage continues to impact Dublin city centre.