FIRE HOSE DELIVERY COUPLING FIRE HOSE DELIVERY COUPLING MATERIALSIZEPERFORMANCEWATER TESTAPPROVAL Gun Metal Garde LTB-2,Stanless steel & Aluminum63 mm,52mm,38mm diaHydraulic Test:21 Kgf/cm2Water tightness 14 Kgf/cm2ISI Marked from Bureau of Indian Standard (63mm)