1)pre galvanized. 2)steel material Q195 3)with one steel coupling and one blue plastic cap 4)size:20mm,25mm,32mm,40mm,50mm BS4568 G.I Electrical Conduit pipeFeatures:1) Hot-dip,electro-galvanized inside and outside surface,the thickness of zinc galvanized on the conduit surface is bigger or equal 14 micro meter2) All the threads, wall thickness, outside diameter are according to British standard3 ...