purchase of high pressure , seamless steel gas filled cylinders fitted with double stage, double side pressure regulators high pressure seamless steel gas filled cylinders fitted with double stage, double side pressure regulators , highpressure seamless steel, gas filled cylinders fitted with double stage, souble side pressure regulators for energy system lab of mechanical engg department , high pressure, seamless steel cylinder fitted with pressure regulator and filled with hydrogen gas ( 99.999%purity ) -cylinder size 46.7 ltr w.c, 7 m3 volume, pressure 140kg / cm2, ss-316 double stage, double side pressure regulator with isi mark for hydrogen gas ( as per detailed specification attached ) , high pressure, seamless steel cylinder fitted with pressure regulator and filled with nitrogengas ( 99.999%purity ) -cylinder size 46.7 ltr w.c, 7m3volume, pressure 140kg / cm2, ss-316 double stage, double side pressure regulator with isi mark for nitrogengas ( as per detailed specification attached ) , high pressure, seamless steel cylinder fitted with pressure regulator and filled with zero air gas -cylinder size 46.7 ltr w.c, 7 m3 volume, pressure 140kg / cm2, ss-316 double stage, double side pressure regulator with isi mark for zero- air gas ( as per detailed specification attached ) , high pressure, seamless steel cylinder fitted with pressure regulator and filled with oxygengas-cylinder size 46.7 ltr w.c, 7 m3volume, pressure 140kg / cm2, ss-316 double stage, double side pressure regulator with isi mark for oxygen gas ( as per detailed specification attached )