Urinals...................2 inches
Kitchen sink...........2 inches
Slop sink................3 inches
Receptacles............11⁄2 inches
Bath tubs................11⁄2 inches
Lavatories..............11⁄2 or 11⁄4 inches
Wash trays.............2 inches

Tell-Tale Pipe

The tell-tale pipe is a small pipe that extends from the trough, pan, or box that is under a line of pipe or fixtures to the open cellar. When water is seen running out of this pipe, it shows that a leak exists somewhere in the line of pipe that is in the box or trough. The use of this pipe saves the destruction of walls and ceilings.