When a private water main supplying more than one house is connected to the city water mains, the public utilities director may require a master meter to be installed near the point where the connection is to be made to the city main. This installation will be at the expense of the owners of the private line according to the regular rates for meter installation. Responsible parties must agree to pay all bills for water served through such meter at regular meter rates. (Prior code § 49-6-81)