as per boq.- 1.01 cylinder nitrous oxide (n2o) 955 ltr with pin index non-interchangeable flush type valve painted blue empty for (as per qr) 1.02 cylinder oxygen (o2) 340 ltr, with pin -index non interchangeable flush type valve painted black with white valve end empty for per qr) 1.03 cylinder oxygen (o2) 623 ltr with nose fitting valve painted black be issued in place with white valve end empty for (as per qr) 1.04 cylinder oxygen (o2) 1246 ltr. with bull nose fitting valve painted black with white valve end empty for (as per qr)