§890.TABLE D. Minimum Water Distribution Pipe Size

Type of Fixture or Device (See Footnotes 1 & 2)		Pipe Size (inches)
Bathtubs		½
Combination sink and tray		½
Drinking fountain		⅜
Dishwasher (domestic)		½
Dishwasher (commercial)		¾
Kitchen sink (residential)		½
Kitchen sink (commercial) 1 Faucet		½
Kitchen sink (commercial) 2 Faucets		¾
Lavatory		⅜
Laundry tray (1, 2 or 3 compartment)		½
Shower (single head)		½
Sinks (service/slop)		½
Sinks (flushing rim)		¾
Urinal (flush tank)		½
Urinal (direct flush valve)		¾
Urinal (siphon jet)		1
Washing machine (automatic)		½
Water closet (tank type)		⅜
Water closet (flush valve type)		1
Hose bibbs		½
Wall hydrant		½
1     For fixtures not listed, the minimum supply branch shall be installed in the diameters required for similar type fixtures.
2     The fixture supply pipe shall be extended to within 12 inches of the point of connection to fixture and be within the same area and physical space as the point of connection to the fixture.

 

(Source:  Amended at 38 Ill. Reg. 9940, effective April 24, 2014)