Contract Bidding Open For Flash Back Arrestor (Dry Type) for regulator end of Oxygen lines to prevent Flash Backs in Oxy Fuel system conforming to EN 730/ISO 5175-1/IS 11006 Standards with Flame Arrestor (FA) and Non Return Valve (NRV) and Thermal Cut Off Valve (TV). Working Pressure: 15 bar. End Connections G 3/8" RH to EN 560/ISO 3253 Standards. Make: MESSER (DGN OXY) or ESAB (PROTEX RO) or GCE (FR-34 R OXY) or WITT (OXYGEN RF53N) only. in Andhra Pradesh