tender for pipe 20 mm (stainless steel) bore complete with socket 20 mm & flange 20mm. to rdsos drg. no. wd-80007-s-11, item no. 11, 15 & 16 alt. no-9 (nine) or latest & as perrdsos specn: as per rdsos specn. no. 04-abr-02 with 6 amendments - last amendmentno. 6 issued on april, 2010 or latest.