... flange .4.Common Size DN50mm - DN300mm, flange pipe flange used electric materials of brass, stainless steel, 10 steel, 10 steel pipe ... material used, stainless steel, copper. common specifications, 1.5KW, 3KW, 6KW ... 12KW, 15KW, 30KW and so on.5.Mainjly for electric water boilers, electric boilers, solar systems, solar water tanks, chemical tanks, ...