(a) Each service line valve must be installed upstream of the regulator or, if there is no regulator, upstream of the meter.
(b) Each service line must have a shut off valve in a readily accessible location that, if feasible, is outside of the building. The valve must be located outside the building:
(1) where the regulator is located within the customer's building;
(2) on service lines to buildings of public assembly; or
(3) on service lines two inches (51 millimeters) or greater in diameter.
(c) Each underground service line valve must be located in a covered durable curb box or standpipe that allows ready operation of the valve and is supported independently of the service line.