Just – the overarching responsibility for the on-going maintenance and repair of an area of common property covered by an Owner’s exclusive use privilege should be prescribed in a Special By-Law (SBL).
However if there’s no SBL or if any that does exist doesn’t specifically provide that the maintenance / replacement of a garden tap/s within that area is the Lot Owner’s responsibility, then if it’s downstream (i.e after) the Lot’s water supply isolator then it’s the Lot Owner’s responsibility, and if it’s on the common supply (i.e controlled by the main water supply isolator) then it’s the Owners Corporation’s responsibility.