Tender For supply of isi marked multi stage gas regulator acetylene with stainless steel diaphragm at first stage and neoprene rubber diaphragm at second stage with bigger plenum chamber 1.5 1st stage to 2nd stage ratio to ensure stability of pressure of 1.5 bar at outlet to is-6901/2009 (second revision) [ warranty period: 30 months after the date of delivery ]