tender for modifications of oxygen valve system for ctvs ot, acc, pgimer, chandigarh ; 1 sitc of copper pipes of following sizes 2 12mm od x 1.0mm thick 3 15mm od x 1.0mm thick 4 22mm od x 1.0mm thick 5 sitc of line isolation valves both side end fittings of following sizes. 6 12mm ball valve 7 15mm ball valve 8 22mm ball valve 9 sitc of zonal valve box (22mm ball valve for vacuum, 15mm ball valve for medical air & oxygen) along with pressure gauge for three gases (oxygen, medical air & vacuum). 10 sitc of medical gas digital alarm system with pressure monitoring for three gases (oxygen, medical air & vacuum). 11 turnkey works include all civil & electrical works including buyback of old material.