supply of flange with socket for 20 nb branch pipe , fixed flange & flange with socket 32 mm. , flange with socket for 20 nb branch pipe. drawing no. : rdso,s drg. no. wd-83062-s-07, alt . 5, item nos. 2 & 3. material and specification: stainless steel to is:6911:1992 (rev.1,incorporating amend .1) grade x 04 cr19ni9 304 s1. [ warranty period: 30 months after the date of delivery ] ] , fixed flange conforming to rdso spec no 04-abr-02.amend -6 rdso drg.no.wd-8306 2-s06 item 1 alt.3. material specification- mild steel to is:2062 fe 410 wa. [ warranty period: 30 mont hs after the date of delivery ] ] , flange with socket 32 mm. for brake pipe. drawing no. : rdsos drg. no. wd-83062-s-7, alt . 6,item no. 2 & 3. material and specification : as per drawing and conforming to rdso spec. no. 04-abr- 2 019 (rev. 2 of december 2019). [ warranty period: 30 months after the date of delivery ] ]