Minimum sizes of fixture supply pipes shall be as listed in Table P811.2.
| Fixture Pipe | Fixture Supply (inches) |
|---|---|
| Bathtubs | 1/2 |
| Combination Sink and Tray | 1/2 |
| Dishwashing Machine, Domestic | 1/2 |
| Drinking Fountain | 3/8 |
| Flushing Rim Sink | 3/4 |
| Hose Bibb | 1/2 |
| Hot Water Tanks, Domestic | 1/2 |
| Kitchen Sink, Hotel or Public | 3/4 |
| Laundry Trays | 1/2 |
| Lavatories | 3/8 |
| Service Sink | 1/2 |
| Shower, Multi-Stall | 3/4 |
| Shower Stalls | 1/2 |
| Urinal, Pedestal, Direct Flush Valve (Flushometer) | 1 |
| Urinal, Stall, Blow-out or Wash-out; Direct Flush Valve (Flushometer) | 3/4 |
| Urinal Tank | 3/8 |
| Wash Fountain, Duo | 1/2 |
| Wash Fountain, all other | 3/4 |
| Washing Machine, Domestic | 1/2 |
| Water Closet Direct Flush Valve (Flushometer) | 1 |
| Water Closet Tank | 3/8 |
The size of the water fixture supply pipe shall be the full nominal diameter as prescribed in
Table P-811.2 and shall be installed undiminished in pipe size to the floor or wall directly adjacent to the fixture it
is intended to serve. Flexible water pipe connectors used in connecting the water supply pipe to fixture faucets and
which provide a rigid joint when made up shall not be considered a reduction in pipe size.