Technical Data:Material: stainless steel, brass, aluminium,carbonized steel(yellow zinc plated)Seal Standard: NBR providedExternal Screw Thread: BSP, NPTStandard: A, B, C, D, E, F, DC, DPSize: 1/2" 3/4" 1" 11/4" 11/2" 2" 21/2" 3" 4" 5" 6"