1. Marks as std, xs and xxs indicate standard weight, extra strong and
double extra strong respectively.
2. Also available Pipes from 1/2" N.B. Schedule Ranging between
20 to SCH 160 of ASTM 106 G.B./ASTM 53 Gr-B, BSS-3059 part A or B, BSS
806 etc. and avialable strong (x) and double extra strong (xx) pipes
in different sizes