Threads are British Standard taper to ISO7 as well as BS21. All of the male threads are BSPT and the female threads are BSPP.
Malleable cast iron, grade W40-05 in accordance to ISO5922/DIN-1692 and they are tested in accordance with ISO-49/DIN-2950. The Max temp is +200oC. and the Max Working Pressure 16BAR.
Visit the The Southern Valve and Fitting Co Ltd website for more information on Malleable Iron Pipe Fittings