supply of modified flap doormodified flap door,flap door arrangement complete for boxnhl wagon. drawing no. : rdso,s drg. no. wd- 23018-s-02, alt. nil , item no. 3,4, 5(a), 5(b), 5(c), 10, 11, 12, 13, 16 and 17 in assembled condition. material and specification : as per drawing. remarks: considering that flap door is a weight sensitive item, inspection should cover sample check of weight to ensure that the same is within the tolerances derived from tolerances permitted on raw material of each parts as per the respective bis specification of raw material of that part. [ warranty period: 30 months after the date of delivery ]