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604.5 Size of Fixture Supply
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The minimum size of a fixture supply pipe shall be as shown in Table 604.5. The fixture supply pipe shall terminate not more than 30 inches (762 mm) from the point of connection to the fixture. A reduced-size flexible water connector installed between the supply pipe and the fixture shall be of an approved type. The supply pipe shall extend to the floor or wall adjacent to the fixture. The minimum size of individual distribution lines utilized in gridded or parallel water distribution systems shall be as shown in Table 604.5.
MINIMUM SIZES OF FIXTURE WATER SUPPLY PIPES
| FIXTURE | MINIMUM PIPE SIZE (inch) |
| Bathtubsa (60" × 32" and smaller) | 1/2 |
| Bathtubsa (larger than 60" × 32") | 1/2 |
| Bidet | 3/8 |
| Combination sink and tray | 1/2 |
| Dishwasher, domestica | 1/2 |
| Drinking fountain | 3/8 |
| Hose bibbs | 1/2 |
| Kitchen sinka | 1/2 |
| Laundry, 1, 2 or 3 compartmentsa | 1/2 |
| Lavatory | 3/8 |
| Shower, single heada | 1/2 |
| Sinks, flushing rim | 3/4 |
| Sinks, service | 1/2 |
| Urinal, flush tank | 1/2 |
| Urinal, flushometer valve | 3/4 |
| Wall hydrant | 1/2 |
| Water closet, flush tank | 3/8 |
| Water closet, flushometer tank | 3/8 |
| Water closet, flushometer valve | 1 |
| Water closet, one piecea | 1/2 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa.
- Where the developed length of the distribution line is 50 feet or less, and the available pressure at the meter is 35 psi or greater, the minimum size of an individual distribution line supplied from a manifold and installed as part of a parallel water distribution system shall be one nominal tube size smaller than the sizes indicated.
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