supply of set of flash back arrester for torch end of oxygen and acetylene to provide flash backs (back fire) in oxygen fuel system with flame arrester. it is provided on both end, torch side and regulator side. total requirement is 02 nos. for oxygen and 02 nos. of acetylene on one gas unit working pressure maximum upto 05 bar for acetylene and 15 bar for oxygen, end connection 3/8 inches, material-brass, type -single ended, firm should submit oem certificate and test report, as per is: 7653-1975, product similar to esab model- frtg 3/8 rh for oxygen, frtg 3/8 lh, regulator side frtg 3/8 rh torch side oxygen, frtg 3/8 lh, torch side acetylene as per annexure-1 attached. one set consists of 04 items in 100 nos.