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The minimum size of a fixture supply pipe shall be as shown in Table 18-29-604.5. The fixture supply pipe shall not terminate more than 30 inches (762 mm) from the point of connection to the fixture. A reduced-size connector installed between the supply pipe and the fixture shall be of approved type. The supply pipe shall extend to the floor or wall adjacent to the fixture.
Fixture | Minimum Pipe Size (inch) |
Fixture | Minimum Pipe Size (inch) |
Bathtubs: 60" by 32" and smaller | 1/2 |
Bathtubs: Larger than 60" by 32" | 1/2 |
Bidet | 3/8 |
Combination sink and tray | 1/2 |
Dishwashing machine (domestic) | 1/2 |
Drinking fountain | 1/2 |
Hose bibbs | 3/4 |
Kitchen sink | 1/2 |
Domestic | 3/4 |
Commercial | 3/4 |
Laundry, 1, 2 or 3 compartments | 1/2 |
Lavatory | 3/8 |
Shower, single head | 1/2 |
Sinks, flushing rim | 3/4 |
Sinks, service | 3/4 |
Urinal, flush tank | 1/2 |
Urinal, flush valve | 1 |
Wall hydrant | 3/4 |
Washing machine (automatic) | 1/2 |
Water closet, flush tank | 1/2 |
Water closet, flush valve | 1 |
Water closet, flushometer tank | 3/8 |
Water closet, one piece | 1/2 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 psi = 6.895 kPa.