supply of medical cylinder , medicine , aa - type oxygen cylinder cyl ( cap-0 . 34 m3 ) , a - type oxygen cylinder cyl ( cap-0 . 62m3 ) , b - type oxygen cylinder cyl ( cap-1 . 5m3 ) , d - type ( bulk ) oxygen cylinder meter cube , a - type nitrous oxide cylinder d type , b-type nitrous oxide cylinder small type , d- type ( bulk ) nitrous oxide cylinder ( 99% pure culture grade nitrogen gas ) : bulk type , a - type carbon di oxide : kg , d- type ( bulk ) carbon di oxide: kg , medical air d type ( bulk ) : mtr . cube , liquid nitrogen : kg , calibration gases conc , oxygen- 15 . 8 % carbon di oxide - 4 . 6% nitrogen - balance cyl capacity ( 1 . 3 m3 ) , diffusion gases carbon mono oxide : 0 . 275% helium : 17 . 71% balance : med grade air cyl capacity ( 1 . 3 m3 ) , argon gas meter cube , hydrogen meter cube