Designed to strengthen the duct wall and provide strong and leak proof transverse joint.BSRIA tested and confirming to DW144 J Rated Flange Identification System.Tested as per BS EN 1507Manufactured by precision roll forming operation, out of hot dipped galvanized steel slit coils.Designed to strengthen the duct wall and provide strong and leak proof transverse joint.Ideal for residential, commercial, and industrial applicationSuitable for low, medium and high pressure class.Excellent corrosion resistance due to hot dipped galvanized coating.