Fire protection accounts are for fire fighting only, through a system of pipelines terminating in private hydrants or sprinkler heads. The account limitations for this type of account are contained in these Rules and Regulations. Fire protection services that are two inches (2") in size shall be metered with a two (2") turbine meter to be purchased from and set by the Department or its authorized agents. One inch (1") or one and one-half inch (1½") fire services shall be metered by 1" or 1 ½" disc meters to be purchased from and set by the Department or its agents.