This standard (Part XIII) lays down the requirements for materials,
patterns, constructions, dimensions and tolerance and finish for traps for use with squatting pans conforming to IS : 2556 (Part III)-1973*.
IS 2556 Pt.13-1973 history
1973IS 2556 Pt.13-1973 Specification for vitreous sanitary ware (vitreous china) Part XIII Specific requirements for squat toilet traps