rate enquiry of medicines for echs , cylinder oxygen ( o2 ) 1246 ltr . with bull nose fitting valve painted black with white valve end empty , cylinder oxygen bull nose fitting fine adjustment valve with pressure gauge and bobbin flow meter with double walled tube , wolf bottle complete ( borosilicate glass ) with tubes and face mask , cylinder oxygen key spanner for , cylinder oxygen stand for 1246 ltr cylinder ) , apparatus oxygen concentrator to provide 95% o2 purity at 5 lpm having specification :- 1 ) flow rate - flow rate ( minimum ) at 93% + / - 3% oxygen purity ( litres per minute ) - 5 2 ) type - type of oxygen concentrator-portable 3 ) oxygen outlet - single 4 ) pressure ( kpa ) - 75 5 ) oxygen tank capacity ( ltrs ) - 5 6 ) power source - electrical cum battery operated battery 7 ) duration in hours ( if bty operated or electrical cum battery operated ) - 3 8 ) battery charging ( if bty operated or electrical cum batterty operated ) ( hrs ) -3 9 ) type of operation - pulse dose cum continuous type 10 ) air delivery adjustable air delivery mechanism - yes 11 ) continuous flow rate ( ltrs per minute ) - 5