All receptacles used as water closets or urinals or otherwise for the disposal of human exereta shall be vitrified earthenware or other approved nonabsorptive watertight material.
All plumbing fixtures shall be installed free and open in a manner to afford access for cleaning. When practical, all pipes from fixtures shall be run to the wall, and no lead trap or pipe shall extend nearer to the floor than 12 inches unless protected by casing.
Water closet bowls and traps shall be made in one piece and of such form as to hold sufficient quantity of water, when filled to the trap overflow, to prevent fouling of surfaces, and shall be provided with integral flushing rinse constructed so as to flush the entire interior of the bowl.
Earthenware traps or water closets or other fixtures with connection through the floor shall be set on an approved slab of tile or marble the full size of the base of the trap except where the floor compartment has a smooth, even surface and is impervious to moisture, in which case the floor slab or template will not be required.