tube m.s.galvanised medium grade 15mm duly isi marked galvinised mild steel tubes electrical resistences welded (erw)/high frequency induction welded (hfiw) / hot finished welded (hfw) confirming to is:1239 (part-i)/1990 (fifth revision) with amdt. no.1 to 5. screwed at both ends as per is:554/1985, socketed at one end and other end protected with plastic thread protector. the socket confirming to is:1239 (part-ii) / 1992 (fourth revision) with amdt. no. 1 in random length of 4 to 7 mtrs.
