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Sec. 477. Replacing old fixtures with new.

When new fixtures are introduced on old work where no back
venting is used, it will be compulsory on the part of the owner
to back vent same or change the waste pipe to conform to this
ordinance, but in all cases where bathtubs are changed only copper,
steel or porcelain or porcelain lined tubs, will be allowed, and
in changing closets only syphon closets with tank will be allowed.
All tubs must be at least three inches above the floor.