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Shutoff valves shall be installed in the following locations:
1. On the fixture supply to each plumbing fixture except one- and two-family or multiple family residential occupancies, or individual guestrooms that are provided with unit shutoff valves in hotels, motels, boarding houses and similar occupancies;
2. On the water supply pipe to each sillcock;
3. On the water supply pipe to each appliance or mechanical equipment; and
4. On water services 1 1/2 inches (40 mm) or larger requiring meters either in the building or in a meter vault, valves shall be installed on the inlet and outlet sides of the meter and as near as practicable thereto. Meters on 1-inch (25 mm) services have a valve on the inlet side only. Valves located in the meter vault shall not eliminate the need for the valve in the building. All such valves shall be accessible for operation at all times.